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87 results on '"Rungsawang, Rakchanok"'

3. Single-shot terahertz imaging

Author

Rungsawang, Rakchanok, Mochiduki, Aya, Ookuma, Shin-ichi, Hattori, Toshiaki, Castleman, A. W., Jr., editor, Toennies, J.P., editor, Zinth, W., editor, Kobayashi, Takayoshi, editor, Okada, Tadashi, editor, Kobayashi, Tetsuro, editor, Nelson, Keith A., editor, and De Silvestri, Sandro, editor

Published
2005
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4. Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal

Author

Trushkevych, Oksana, Xu, Huan, Lu, Tianxin, Zeitler, J. Axel, Rungsawang, Rakchanok, Golden, Felix, Collings, Neil, and Crossland, William A.

Subjects
Spectra (Spectroscopy) -- Measurement, Isocyanates -- Optical properties, Liquid crystals -- Optical properties, Liquid crystals -- Composition, Astronomy, Physics
Abstract

Tunable materials with high anisotropy of refractive index and low loss are of particular interest in the microwave and terahertz range. Nematic liquid crystals are highly sensitive to electric and magnetic fields and may be designed to have particularly high birefringence. In this paper we investigate birefringence and absorption losses in an isothiocyanate based liquid crystal (designed for high anisotropy) in a broad range of the electromagnetic spectrum, namely 0.1-4 GHz 30 GHz, 0.5-1.8 THz, and in the visible and near-infrared region (400 nm-1600 nm). We report high birefringence (An = 0.19 - 0.395) and low loss in this material. This is attractive for tunable microwave and terahertz device applications. OCIS codes: 300.6390, 300.6495, 300.6550, 160.3710.

Published
2010

7. Quantitative measurements of amino acids by terahertz time-domain transmission spectroscopy

Author

Ueno, Yuko, Rungsawang, Rakchanok, Tomita, Isao, and Ajito, Katsuhiro

Subjects
Amino acids -- Structure, Amino acids -- Spectra, Absorption spectra -- Analysis, Chemistry
Abstract

The quantitative analysis of amino acids by terahertz (THz) time-domain absorption spectroscopy is demonstrated. The optical densities of the amino acids were found to be linearly proportional to the concentration. The molar absorption coefficients of L-glutamic acid (L-Glu), L-glutamic acid sodium salt (Na-L-Glu), L-glutamic acid hydrochloric salt (HCl-L-Glu), L-cysteine (L-Cys), and L-histidine (L-His) were calculated by averaging the THz spectra of the amino acids at several different concentrations in approximately the 0.2-1.0 mol [L.sup.-1] range. The concentrations of L-Glu, L-Cys, and L-His mixed samples were successfully calculated with errors of less than 11% and 20% when their concentrations were higher than 0.45 and 0.22 mol [L.sup.-1], respectively, by using the obtained molar absorption coefficient.

Published
2006

9. Angle-dependent terahertz time-domain spectroscopy of amino acid single crystals

Author

Rungsawang, Rakchanok, Ueno, Yuko, Tomita, Isao, and Ajito, Katsuhiro

Subjects
Terahertz radiation -- Observations, Amino acids -- Spectra, Crystals -- Structure, Crystals -- Research, Chemicals, plastics and rubber industries
Abstract

A report on the measurement of absorption spectras using angle-dependent terahertz (THz) time-domain spectroscopy for amino acid single crystals of L-cysteine and L-histidine is presented. Linearly polarized THz radiation enables to observe angle-dependent far-infrared absorption spectra of amino aid single crystals and determine the direction of the oscillating dipole of the molecules in the 20-100 [cm.sup.-1] range.

Published
2006

13. Gain switching and injection seeding of terahertz quantum cascade lasers

Author

Jukam, Nathan, Maysonnave, Jean, Oustinov, Dimitri, Rungsawang, Rakchanok, Madéo, Julien, Cavalié, P., Manquest, Christophe, Filloux, Pascal, Barbieri, Stefano, Sirtori, Carlo, Marcadet, Xavier, Khanna, Suraj, Linfield, Edmund, Davies, Alexander Giles, Dhillon, Sukhdeep, Tignon, Jérôme, Laboratoire Pierre Aigrain (LPA), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Thales Research and Technology [Palaiseau], THALES, School of Electronic and Electrical Engineering, University of Leeds, Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and THALES [France]

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2011

14. Ultrafast Gain Switching of THz Quantum Cascade Lasers: THz pulse amplification and Injection Seeding

Author

Dhillon, Sukhdeep, Jukam, Nathan, Oustinov, Dimitri, Rungsawang, Rakchanok, Maysonnave, Jean, Madéo, Julien, Cavalié, P., Barbieri, Stefano, Filloux, Pascal, Sirtori, Carlo, Tignon, Jérôme, Laboratoire Pierre Aigrain (LPA), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), de Vaulchier, Louis-Anne, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2011

15. Engineering Quantum Cascade Lasers for Ultrafast Terahertz Spectroscopy

Author

Dhillon, Sukhdeep, Jukam, Nathan, Oustinov, Dimitri, Rungsawang, Rakchanok, Madéo, Julien, Tignon, Jérôme, Laboratoire Pierre Aigrain (LPA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and de Vaulchier, Louis-Anne

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2011

16. Terahertz time domain spectroscopy of phonon-depopulation based quantum cascade lasers

Author

Rungsawang, Rakchanok, Dhillon, Sukhdeep, Jukam, Nathan, Oustinov, Dimitri, Madéo, Julien, Colombelli, Raffaele, Dean, Paul, Salih, Mohammed, Khanna, Suraj, Linfield, Edmund, Davies, Alexander Giles, Tignon, Jérôme, Laboratoire Pierre Aigrain (LPA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut d'Electronique Fondamentale, Université Paris-Sud - Paris 11 (UP11), School of Electronic and Electrical Engineering, University of Leeds, Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Published
2010

17. Quantum cascade laser based terahertz amplifiers

Author

Jukam, Nathan, Rungsawang, Rakchanok, Dhillon, Sukhdeep, Oustinov, Dimitri, Madéo, Julien, Barbieri, Stefano, Manquest, Christophe, Sirtori, Carlo, Khanna, Suraj, Linfield, Edmund, Davies, Alexander Giles, Tignon, Jérôme, Laboratoire Pierre Aigrain (LPA), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), School of Electronic and Electrical Engineering, University of Leeds, Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), de Vaulchier, Louis-Anne, Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2010

18. Ultra-fast terahertz time-domain spectroscopy of quantum cascade lasers

Author

Maysonnave, Jean, Cavalié, P., Madéo, Julien, Oustinov, Dimitri, Rungsawang, Rakchanok, Jukam, Nathan, Dhillon, Sukhdeep, Tignon, Jérôme, Laboratoire Pierre Aigrain (LPA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and de Vaulchier, Louis-Anne

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Published
2010

19. Terahertz amplifier based on gain switching in a quantum cascade

Author

Jukam, Nathan, Rungsawang, Rakchanok, Dhillon, Sukhdeep, Oustinov, Dimitri, Madéo, Julien, Barbieri, Stefano, Manquest, Christophe, Sirtori, Carlo, Khanna, Suraj, Linfield, Edmund, Davies, Alexander Giles, Tignon, Jérôme, Laboratoire Pierre Aigrain (LPA), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), School of Electronic and Electrical Engineering, University of Leeds, Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and de Vaulchier, Louis-Anne

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Published
2010

20. Gain Enhancement in Terahertz Quantum Cascade Lasers using Anti-Reflection Coating

Author

Rungsawang, Rakchanok, Jukam, Nathan, Maysonnave, Jean, Cavalié, P., Madéo, Julien, Oustinov, Dimitri, Dhillon, Sukhdeep, Gellie, Pierre, Barbieri, Stefano, Sirtori, Carlo, Beere, Harvey E., Ritchie, David A., Tignon, Jérôme, Laboratoire Pierre Aigrain (LPA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Cavendish Laboratory, University of Cambridge [UK] (CAM), de Vaulchier, Louis-Anne, Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Published
2010

21. Gain Enhancement in Terahertz Quantum Cascade Laser by Anti-Reflection Coating

Author

Rungsawang, Rakchanok, Jukam, Nathan, Maysonnave, Jean, Cavalié, P., Gellie, Pierre, Barbieri, Stefano, Sirtori, Carlo, Beere, H.E., Ritchie, D.A., Madéo, Julien, Oustinov, Dimitri, Dhillon, Sukhdeep, Tignon, Jérôme, de Vaulchier, Louis-Anne, Laboratoire Pierre Aigrain (LPA), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Cavendish Laboratory, University of Cambridge [UK] (CAM), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Published
2010

22. Terahertz amplifier based on gain switching in a quantum cascade laser

Author

Jukam, Nathan, Dhillon, Sukhdeep, Oustinov, Dimitri, Rungsawang, Rakchanok, Madéo, Julien, Barbieri, Stefano, Manquest, Christophe, Sirtori, Carlo, Khanna, Suraj, Linfield, Edmund, Davies, Alexander Giles, Tignon, Jérôme, de Vaulchier, Louis-Anne, Laboratoire Pierre Aigrain (LPA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), School of Electronic and Electrical Engineering, University of Leeds, Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS, [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Abstract

International audience

Published
2010

23. Spin flip excitations in doped CdMnTe two-dimensional electron gases using terahertz time-domain spectroscopy

Author

Oustinov, Dimitri, Rungsawang, Rakchanok, Maysonnave, Jean, Madéo, Julien, Jukam, Nathan, Dhillon, Sukhdeep, Perez, Florent, Tignon, Jérôme, Laboratoire Pierre Aigrain (LPA), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and de Vaulchier, Louis-Anne

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Physics::Optics, [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Abstract

n recent years, the scientific community has sought to better understand the dynamics of spins in semiconductors. Such an interest was driven by the foreseen possibility of using novel materials combining semiconducting with magnetic properties. These devices, called semi-magnetic semiconductors, could then be implemented in optoelectronic applications where information would be stored on spins. CdMnTe is promising material for such applications and its semi-magnetic properties are being extensively investigated. Spin wave excitations and single particle spin flips were investigated in doped CdMnTe two-dimensional electron gases (2DEG) using Raman spectroscopy under a static magnetic field. These experiments have shown the excitation energies and dispersion of the collective and individual response of spins, which happen in the THz spectral range. Terahertz time-domain spectroscopy (TDS) is a convenient tool to directly investigate intersubband electronic transitions. This technique allows the measurement of the phaseresolved transient THz field emitted by a photoconductive antenna and sent through a sample. Terahertz TDS experiments are expected to give more accurate estimates of the resonance frequencies of spins because they do not generate holes unlike Raman spectroscopy experiments. Furthermore, it would be possible to probe the relaxation times of these spin excitations using pump-probe experiments in the future.

Published
2010

27. Phase-sensitive high-speed THz imaging.

Author

Hattori, Toshiaki, Ohta, Keisuke, Rungsawang, Rakchanok, and Tukamoto, Keiji

Subjects
PHOTOCONDUCTIVITY, ELECTRIC fields, FOURIER transforms, OPTICS
Abstract

Phase-sensitive high-speed imaging of terahertz (THz) radiation was achieved by introducing the optical heterodyne detection method to high-speed electro-optic sampling of THz images. Intense THz pulses obtained from a large-aperture photoconductive antenna were used as the source. The electric field distribution on the focal plane of focused half-cycle THz pulses was observed using the apparatus. Annular spatial profiles were observed in the time-dependent images. The frequency-dependent distribution calculated by means of Fourier transformation showed almost diffraction-limited focusing. [ABSTRACT FROM AUTHOR]

Published
2004
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28. Surface-emitting photonic crystal terahertz quantum cascade lasers.

Author

Marshall, Owen P., Apostolopoulos, Vasilis, Freeman, Joshua R., Rungsawang, Rakchanok, Beere, Harvey E., and Ritchie, David A.

Subjects
FIELD emission, PLASMONS (Physics), SUBSTRATES (Materials science), PLASMA waveguides, WAVELENGTHS, PHOTOLITHOGRAPHY
Abstract

Surface-emitting terahertz quantum cascade lasers based on double-metal waveguides incorporating photonic crystal structures have been demonstrated. Far-field emission patterns are dominated by lobes close to the surface normal. In addition to modified emission profiles, enhanced output powers are also displayed in comparison to standard ridge waveguides, with over 2 mW peak power observed at a heat sink temperature of 10 K. [ABSTRACT FROM AUTHOR]

Published
2008
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30. Terahertz-wave generation from quasi-phase-matched GaP for 1.55 μm pumping.

Author

Tomita, Isao, Suzuki, Hiroyuki, Ito, Hiroshi, Takenouchi, Hirokazu, Ajito, Katsuhiro, Rungsawang, Rakchanok, and Ueno, Yuko

Subjects
POLARIZATION of electromagnetic waves, POLARIZATION spectroscopy, RADIO waves, RADIO frequency, SPECTRUM analysis
Abstract

We have realized a terahertz (THz)-wave source employing difference frequency generation (DFG) from a quasi-phase-matched GaP stack pumped at 1.55 μm. We observed THz waves with enhanced power by quasi-phase matching (QPM) in the <110> direction of GaP with a <111> polarization direction for the incidence of two pump lights with the same propagation and polarization directions. We obtained THz-wave power proportional to the product of two pump-light powers due to DFG. We also confirmed that power peaks appeared at around 1 and 2.6 THz reflecting the first- and the third-order QPM, respectively. [ABSTRACT FROM AUTHOR]

Published
2006
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31. Terahertz Time-domain Spectra of Inter- and Intramolecular Hydrogen Bonds of Fumaric and Maleic Acids

Author

Ueno, Yuko, Rungsawang, Rakchanok, Tomita, Isao, and Ajito, Katsuhiro

Abstract

The inter- and intramolecular hydrogen-bonding modes of two steric isomers, namely fumaric acid and maleic acid, are observed by using terahertz time-domain spectroscopy (THz-TDS). The intermolecular modes observed with fumaric acid crystals are inactivated by incorporating the molecules in the nano-sized pores of a mesoporous silicate (SBA-16) due to the separation of the molecules, whereas the intramolecular modes of maleic acid of the crystal and the incorporated samples are similar.

Published
2006
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32. Terahertz Images of Biological Molecules: Frequency Dependence of Spatial Resolution Using a Tunable Terahertz Laser Source.

Author

Ueno, Yuko, Rungsawang, Rakchanok, Tomita, Isao, and Ajito, Katsuhiro

Abstract

The spatial resolution of transmitted terahertz (THz) images of metal slits and protein [myoglobin (Mb)] thin films was analyzed at 1.40, 1.63, and 2.55 THz by using continuous THz waves from a tunable gas laser. The resolution of the THz images of the metal slit was 0.40, 0.35, and 0.45 mm at 2.55, 1.63, and 1.40 THz, respectively. The spatial resolution is determined not only by the diffraction limit of the wavelength of the THz wave but also by other experimental conditions such as laser power. The resolution of the THz images of Mb thin films was 0.55 and 0.60 mm at 2.55 and 1.63 THz, respectively. The approximately twofold stronger THz wave absorption of Mb film at 2.55 THz than at 1.63 THz provides the better resolution. By using a THz wave with a frequency at which the target sample has strong absorption we can obtain a THz image with good resolution. [ABSTRACT FROM AUTHOR]

Published
2008
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34. High accuracy simulations of optical propagation in nanophotonic devices

Author

Cole, James B., Banerjee, Saswatee, and Rungsawang, Rakchanok

Subjects
*FINITE differences, *NUMERICAL analysis, *CRYSTALLOGRAPHY, *CRYSTALS
Abstract

Abstract: We introduce a new high accuracy second-order finite-difference time-domain (FDTD) algorithm based on non-standard finite differences, and use it to investigate light propagation in subwavelength structures such as photonic crystals. [Copyright &y& Elsevier]

Published
2007
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35. A 2 D high accuracy slope measuring system based on a Stitching Shack Hartmann Optical Head.

Author

Idir M, Kaznatcheev K, Dovillaire G, Legrand J, and Rungsawang R

Abstract

We present a 2D Slope measuring System based on a Stitching Shack Hartmann Optical Head (SSH-OH) aiming to perform high accuracy optical metrology for X-ray mirrors. This system was developed to perform high-accuracy automated metrology for extremely high quality optical components needed for synchrotrons or Free Electrons Lasers (FEL), EUV lithography and x-ray astronomy with slope error accuracy better than 50 nrad rms.

Published
2014
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36. Phase seeding of a terahertz quantum cascade laser.

Author

Oustinov D, Jukam N, Rungsawang R, Madéo J, Barbieri S, Filloux P, Sirtori C, Marcadet X, Tignon J, and Dhillon S

Abstract

The amplification of spontaneous emission is used to initiate laser action. As the phase of spontaneous emission is random, the phase of the coherent laser emission (the carrier phase) will also be random each time laser action begins. This prevents phase-resolved detection of the laser field. Here, we demonstrate how the carrier phase can be fixed in a semiconductor laser: a quantum cascade laser (QCL). This is performed by injection seeding a QCL with coherent terahertz pulses, which forces laser action to start on a fixed phase. This permits the emitted laser field to be synchronously sampled with a femtosecond laser beam, and measured in the time domain. We observe the phase-resolved buildup of the laser field, which can give insights into the laser dynamics. In addition, as the electric field oscillations are directly measured in the time domain, QCLs can now be used as sources for time-domain spectroscopy.

Published
2010
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37. Magnetically induced pattern formation in phase separating polymer-solvent-nanoparticle mixtures.

Author

Rungsawang R, da Silva J, Wu CP, Sivaniah E, Ionescu A, Barnes CH, and Darton NJ

Abstract

Permanent magnetic structures with controlled dimension and architecture (labyrinthine, hexagonal, or dispersed columnar) are formed in a partially miscible ferrofluid-nonferrofluid mixture under the influence of a perpendicular magnetic field. The origin of the permanent structures, which have characteristic lateral dimensions ranging from 1 to 10  μm, is the repartitioning of the ferrofluid carrier solvent into the nonferrofluid polymeric phase. This polymer-solvent phase separation under a magnetic field leads to departures from the expected final dimension of the magnetically stabilized ferrofluid droplet sizes.

Published
2010
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38. Terahertz notch filter using intermolecular hydrogen bonds in a sucrose crystal.

Author

Rungsawang R, Ueno Y, Tomita I, and Ajito K

Abstract

We propose a THz notch filter that uses the absorption of the intermolecular hydrogen bonds in a molecular crystal such as sucrose. Terahertz (THz) time-domain spectroscopy was used to investigate the absorption characteristics of a rotationally oriented sucrose single crystal in the 0.3 - 3.0 THz frequency range. The crystal was set so that the (100) face (cleavage) was normal to the THz propagation direction. The two lowest frequency intermolecular hydrogen bonding bands clearly exist at room temperature and at 1.45 and 1.64 THz when the b-axis of the crystal is parallel and perpendicular to the THz polarization, respectively. In contrast, they disappear when the b-axis is reversed. This absorption feature means that it would be possible to utilize a sucrose crystal as a notch filter with a 1.45-THz band center for the 0.1-1.7 THz range and with a 1.64-THz band center for the 0.1-1.9 THz range. When the crystal is rotated, the transmitted intensities of the frequency components near the absorption bands alternate as a sine function against angle. The spectroscopic properties of the sucrose filter were confirmed by continuous THz wave imaging.

Published
2006
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