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647 results on '"Baumberg, Jeremy J."'

1. Direct linearly polarized electroluminescence from perovskite nanoplatelet superlattices

Author

Ye, Junzhi, Ren, Aobo, Dai, Linjie, Baikie, Tomi K., Guo, Renjun, Pal, Debapriya, Gorgon, Sebastian, Heger, Julian E., Huang, Junyang, Sun, Yuqi, Arul, Rakesh, Grimaldi, Gianluca, Zhang, Kaiwen, Shamsi, Javad, Huang, Yi-Teng, Wang, Hao, Wu, Jiang, Koenderink, A. Femius, Torrente Murciano, Laura, Schwartzkopf, Matthias, Roth, Stephen V., Müller-Buschbaum, Peter, Baumberg, Jeremy J., Stranks, Samuel D., Greenham, Neil C., Polavarapu, Lakshminarayana, Zhang, Wei, Rao, Akshay, and Hoye, Robert L. Z.

Published
2024
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10. Few-emitter lasing in single ultra-small nanocavities

Author

Ojambati Oluwafemi S., Arnardóttir Kristín B., Lovett Brendon W., Keeling Jonathan, and Baumberg Jeremy J.

Subjects
nanocavity, plasmonic nanocavity, nanolaser, emitter, nonlinear light emission, Physics, QC1-999
Abstract

Lasers are ubiquitous for information storage, processing, communications, sensing, biological research and medical applications. To decrease their energy and materials usage, a key quest is to miniaturise lasers down to nanocavities. Obtaining the smallest mode volumes demands plasmonic nanocavities, but for these, gain comes from only a single or few emitters. Until now, lasing in such devices was unobtainable due to low gain and high cavity losses. Here, we demonstrate a form of ‘few emitter lasing’ in a plasmonic nanocavity approaching the single-molecule emitter regime. The few-emitter lasing transition significantly broadens, and depends on the number of molecules and their individual locations. We show this non-standard few-emitter lasing can be understood by developing a theoretical approach extending previous weak-coupling theories. Our work paves the way for developing nanolaser applications as well as fundamental studies at the limit of few emitters.

Published
2024
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13. Multi-faceted plasmonic nanocavities

Author

Bedingfield Kalun, Elliott Eoin, Gisdakis Arsenios, Kongsuwan Nuttawut, Baumberg Jeremy J., and Demetriadou Angela

Subjects
facet, nanoparticle, nanogap, crystallization facet, nanocavity, quasi-normal modes, Physics, QC1-999
Abstract

Plasmonic nanocavities form very robust sub-nanometer gaps between nanometallic structures and confine light within deep subwavelength volumes to enable unprecedented control of light–matter interactions. However, spherical nanoparticles acquire various polyhedral shapes during their synthesis, which has a significant impact in controlling many light–matter interactions, such as photocatalytic reactions. Here, we focus on nanoparticle-on-mirror nanocavities built from three polyhedral nanoparticles (cuboctahedron, rhombicuboctahedron, decahedron) that commonly occur during the synthesis. Their photonic modes have a very intricate and rich optical behaviour, both in the near- and far-field. Through a recombination technique, we obtain the total far-field produced by a molecule placed within these nanocavities, to reveal how energy couples in and out of the system. This work paves the way towards understanding and controlling light–matter interactions, such as photocatalytic reactions and non-linear vibrational pumping, in such extreme environments.

Published
2023
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16. Theory of strong coupling between molecules and surface plasmons on a grating

Author

Rider Marie S., Arul Rakesh, Baumberg Jeremy J., and Barnes William L.

Subjects
gratings, molecule–light interactions, strong coupling, surface plasmons, Physics, QC1-999
Abstract

The strong coupling of molecules with surface plasmons results in hybrid states which are part molecule, part surface-bound light. Since molecular resonances may acquire the spatial coherence of plasmons, which have mm-scale propagation lengths, strong-coupling with molecular resonances potentially enables long-range molecular energy transfer. Gratings are often used to couple incident light to surface plasmons, by scattering the otherwise non-radiative surface plasmon inside the light-line. We calculate the dispersion relation for surface plasmons strongly coupled to molecular resonances when grating scattering is involved. By treating the molecules as independent oscillators rather than the more typically considered single collective dipole, we find the full multi-band dispersion relation. This approach offers a natural way to include the dark states in the dispersion. We demonstrate that for a molecular resonance tuned near the crossing point of forward and backward grating-scattered plasmon modes, the interaction between plasmons and molecules gives a five-band dispersion relation, including a bright state not captured in calculations using a single collective dipole. We also show that the role of the grating in breaking the translational invariance of the system appears in the position-dependent coupling between the molecules and the surface plasmon. The presence of the grating is thus not only important for the experimental observation of molecule-surface-plasmon coupling, but also provides an additional design parameter that tunes the system.

Published
2022
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23. Cascaded nanooptics to probe microsecond atomic-scale phenomena

Author

Kamp, Marlous, de Nijs, Bart, Kongsuwan, Nuttawut, Saba, Matthias, Chikkaraddy, Rohit, Readman, Charlie A., Deacon, William M., Griffiths, Jack, Barrow, Steven J., Ojambati, Oluwafemi S., Wright, Demelza, Huang, Junyang, Hess, Ortwin, Scherman, Oren A., and Baumberg, Jeremy J.

Published
2020

24. Nanoscopy through a plasmonic nanolens

Author

Horton, Matthew J., Ojambati, Oluwafemi S., Chikkaraddy, Rohit, Deacon, William M., Kongsuwan, Nuttawut, Demetriadou, Angela, Hess, Ortwin, and Baumberg, Jeremy J.

Published
2020

31. Microcavity-like exciton-polaritons can be the primary photoexcitation in bare organic semiconductors

Author

Pandya, Raj, Chen, Richard Y. S., Gu, Qifei, Sung, Jooyoung, Schnedermann, Christoph, Ojambati, Oluwafemi S., Chikkaraddy, Rohit, Gorman, Jeffrey, Jacucci, Gianni, Onelli, Olimpia D., Willhammar, Tom, Johnstone, Duncan N., Collins, Sean M., Midgley, Paul A., Auras, Florian, Baikie, Tomi, Jayaprakash, Rahul, Mathevet, Fabrice, Soucek, Richard, Du, Matthew, Alvertis, Antonios M., Ashoka, Arjun, Vignolini, Silvia, Lidzey, David G., Baumberg, Jeremy J., Friend, Richard H., Barisien, Thierry, Legrand, Laurent, Chin, Alex W., Yuen-Zhou, Joel, Saikin, Semion K., Kukura, Philipp, Musser, Andrew J., and Rao, Akshay

Published
2021
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36. Morphology dependence of nanoparticle-on-mirror geometries: A quasinormal mode analysis

Author

Bedingfield Kalun, Elliott Eoin, Kongsuwan Nuttawut, Baumberg Jeremy J., and Demetriadou Angela

Subjects
polygon, npom, nanocavity, quasinormal mode, plasmonic nanoantenna, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Physics, QC1-999
Abstract

Plasmonic nanoantennas are able to produce extreme enhancements by concentrating electromagnetic fields into sub-wavelength volumes. Recently, one of the most commonly used nanoantennas is the nanoparticle-on-mirror geometry, which allowed for the room temperature strong coupling of a single molecule. Very few studies offer analysis of near-field mode decompositions, and they mainly focus on spherical and/or cylindrically-faceted nanoparticle-on-mirror geometries. Perfectly spherical nanoparticles are not easy to fabricate, with recent publications revealing that a rhombicuboctahedron is a commonly occurring nanoparticle shape – due to the crystalline nature of metallic nanoparticles. In this paper, we perform a quasi-normal mode analysis for the rhombicuboctahedron-on-mirror nanoantenna and map the field distributions of each mode. We examine how the geometry of the cavity defines the near-field distribution and energies of the modes, and we show that in some cases the mode degeneracies break. This has a significant impact on the radiative emission and far-field profile of each mode, which are measured experimentally. Understanding how realistic nanoantenna geometries behave in the near-field and far-field helps us design antennas with specific properties for controlling and sensing quantum emitters in plasmonic systems.

Published
2022
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44. Single-molecule optomechanics in "picocavities"

Author

Benz, Felix, Schmidt, Mikolaj K., Dreismann, Alexander, Chikkaraddy, Rohit, Zhang, Yao, Demetriadou, Angela, Carnegie, Cloudy, Ohadi, Hamid, de Nijs, Bart, Esteban, Ruben, Aizpurua, Javier, and Baumberg, Jeremy J.

Published
2016

45. Light-induced actuating nanotransducers

Author

Ding, Tao, Valev, Ventsislav K., Salmon, Andrew R., Forman, Chris J., Smoukov, Stoyan K., Scherman, Oren A., Frenkel, Daan, and Baumberg, Jeremy J.

Published
2016

46. Raman-probing the local ultrastrong coupling of vibrational plasmon-polaritons on metallic gratings

Author

Arul, Rakesh, Menghrajani, Kishan, Rider, Marie S., Chikkaraddy, Rohit, Barnes, William L., and Baumberg, Jeremy J.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), FOS: Physical sciences, Optics (physics.optics), Physics - Optics
Abstract

Strong coupling of molecular vibrations with light creates polariton states, enabling control over many optical and chemical properties. However, the near-field signatures of strong coupling are difficult to map as most cavities are closed systems. Surface-enhanced Raman microscopy of open metallic gratings under vibrational strong coupling enables the observation of spatial polariton localization in the grating near-field, without the need for scanning probe microscopies. The lower polariton is localized at the grating slots, displays a strongly asymmetric lineshape, and gives greater plasmon-vibration coupling strength than measured in the far-field. Within these slots, the local field strength pushes the system into the ultrastrong coupling regime. Models of strong coupling which explicitly include the spatial distribution of emitters can account for these effects. Such gratings form a new system for exploring the rich physics of polaritons and the interplay between their near- and far-field properties through polariton-enhanced Raman scattering (PERS).

Published
2023

50. Photoluminescence upconversion in monolayer WSe2 activated by plasmonic cavities through resonant excitation of dark excitons.

Author

Mueller, Niclas S., Arul, Rakesh, Kang, Gyeongwon, Saunders, Ashley P., Johnson, Amalya C., Sánchez-Iglesias, Ana, Hu, Shu, Jakob, Lukas A., Bar-David, Jonathan, de Nijs, Bart, Liz-Marzán, Luis M., Liu, Fang, and Baumberg, Jeremy J.

Subjects
PLASMONICS, QUANTUM optics, PHOTON emission, PHOTOLUMINESCENCE, PHOTOLUMINESCENCE measurement, STATISTICAL measurement, PHOTON upconversion, EXCITON theory, EMBEDDING theorems
Abstract

Anti-Stokes photoluminescence (PL) is light emission at a higher photon energy than the excitation, with applications in optical cooling, bioimaging, lasing, and quantum optics. Here, we show how plasmonic nano-cavities activate anti-Stokes PL in WSe2 monolayers through resonant excitation of a dark exciton at room temperature. The optical near-fields of the plasmonic cavities excite the out-of-plane transition dipole of the dark exciton, leading to light emission from the bright exciton at higher energy. Through statistical measurements on hundreds of plasmonic cavities, we show that coupling to the dark exciton leads to a near hundred-fold enhancement of the upconverted PL intensity. This is further corroborated by experiments in which the laser excitation wavelength is tuned across the dark exciton. We show that a precise nanoparticle geometry is key for a consistent enhancement, with decahedral nanoparticle shapes providing an efficient PL upconversion. Finally, we demonstrate a selective and reversible switching of the upconverted PL via electrochemical gating. Our work introduces the dark exciton as an excitation channel for anti-Stokes PL in WSe2 and paves the way for large-area substrates providing nanoscale optical cooling, anti-Stokes lasing, and radiative engineering of excitons. Here, the authors perform statistical measurements on hundreds of plasmonic nano-cavities embedding WSe2 monolayers, and show the activation of anti-Stokes photoluminescence in WSe2 through resonant excitation of a dark exciton at room temperature. [ABSTRACT FROM AUTHOR]

Published
2023
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