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127 results on '"Ams M"'

1. Ultrafast laser inscribed integrated photonics: material science to device development

Author

Gross S., Meany T. D., Arriola A., Miese C., Williams R. J., Duan Y., Liu Q., Spaleniak I., Ams M., Dekker P., Jovanovic N., Fuerbach A., Ireland M., Steel M. J., Lancaster D. G., Heidepriem H. Ebendorff, Monro T. M., and Withford M. J.

Subjects
Femtosecond laser inscription, direct-write, refractive index, photonics, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Detailed studies of intense light – material interactions has led to new insights into fs laser induced refractive index change in a range of glass types. This body of knowledge enables the development of advanced processing methodologies, resulting in novel planar and 3D guided wave devices. We will review the chemistry and morphology associated with fs laser induced refractive index change in multi-component glasses such as ZBLAN, phosphates and silicates, and discuss how these material changes inform our research programs developing a range of active and passive lightwave systems.

Published
2013
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2. Starlight Demonstration of the Dragonfly Instrument: an Integrated Photonic Pupil Remapping Interferometer for High Contrast Imaging

Author

Jovanovic, N., Tuthill, P. G., Norris, B., Gross, S., Stewart, P., Charles, N., Lacour, S., Ams, M., Lawrence, J. S., Lehmann, A., Niel, C., Robertson, J. G., Marshall, G. D., Ireland, M., Fuerbach, A., and Withford, M. J.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Optics
Abstract

In the two decades since the first extra-solar planet was discovered, the detection and characterization of extra-solar planets has become one of the key endeavors in all of modern science. Recently direct detection techniques such as interferometry or coronography have received growing attention because they reveal the population of exoplanets inaccessible to Doppler or transit techniques, and moreover they allow the faint signal from the planet itself to be investigated. Next-generation stellar interferometers are increasingly incorporating photonic technologies due to the increase in fidelity of the data generated. Here, we report the design, construction and commissioning of a new high contrast imager; the integrated pupil-remapping interferometer; an instrument we expect will find application in the detection of young faint companions in the nearest star-forming regions. The laboratory characterisation of the instrument demonstrated high visibility fringes on all interferometer baselines in addition to stable closure phase signals. We also report the first successful on-sky experiments with the prototype instrument at the 3.9-m Anglo-Australian Telescope. Performance metrics recovered were consistent with ideal device behaviour after accounting for expected levels of decoherence and signal loss from the uncompensated seeing. The prospect of complete Fourier-coverage coupled with the current performance metrics means that this photonically-enhanced instrument is well positioned to contribute to the science of high contrast companions., Comment: 10 pages, 7 figures, accepted to Mon. Not. of Roy. Ast. Soc., 2012

Published
2012
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3. Two-photon quantum walks in an elliptical direct-write waveguide array

Author

Owens, J. O., Broome, M. A., Biggerstaff, D. N., Goggin, M. E., Fedrizzi, A., Linjordet, T., Ams, M., Marshall, G. D., Twamley, J., Withford, M. J., and White, A. G.

Subjects
Quantum Physics, Physics - Optics
Abstract

Integrated optics provides an ideal test bed for the emulation of quantum systems via continuous-time quantum walks. Here we study the evolution of two-photon states in an elliptic array of waveguides. We characterise the photonic chip via coherent-light tomography and use the results to predict distinct differences between temporally indistinguishable and distinguishable two-photon inputs which we then compare with experimental observations. Our work highlights the feasibility for emulation of coherent quantum phenomena in three-dimensional waveguide structures., Comment: 8 pages, 7 figures

Published
2011
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4. Laser written waveguide photonic quantum circuits

Author

Marshall, G. D., Politi, A., Matthews, J. C. F., Dekker, P., Ams, M., Withford, M. J., and O'Brien, J. L.

Subjects
Quantum Physics, Physics - Optics
Abstract

We report photonic quantum circuits created using an ultrafast laser processing technique that is rapid, requires no lithographic mask and can be used to create three-dimensional networks of waveguide devices. We have characterized directional couplers--the key functional elements of photonic quantum circuits--and found that they perform as well as lithographically produced waveguide devices. We further demonstrate high-performance interferometers and an important multi-photon quantum interference phenomenon for the first time in integrated optics. This direct-write approach will enable the rapid development of sophisticated quantum optical circuits and their scaling into three-dimensions., Comment: 4 pages, 4 figures. Submitted to Optics Express 04/04/2009, accepted for publication 30/06/09

Published
2009
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5. Investigation of ultrafast laser photonic material interactions: challenges for directly written glass photonics

Author

Ams, M., Marshall, G. D., Dekker, P., Dubov, M., Mezentsev, V. K., Bennion, I., and Withford, M. J.

Subjects
Physics - Optics
Abstract

Currently, direct-write waveguide fabrication is probably the most widely studied application of femtosecond laser micromachining in transparent dielectrics. Devices such as buried waveguides, power splitters, couplers, gratings and optical amplifiers have all been demonstrated. Waveguide properties depend critically on the sample material properties and writing laser characteristics. In this paper we discuss the challenges facing researchers using the femtosecond laser direct-write technique with specific emphasis being placed on the suitability of fused silica and phosphate glass as device hosts for different applications., Comment: 11 pages, 87 references, 11 figures. Article in review

Published
2008
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7. The polysemous concepts of psychomotricity and catatonia: A European multi-consensus perspective

Author

Foucher, J.R., Foucher, J.R., Jeanjean, L.C., de Billy, C.C., Pfuhlmann, B., Clauss, J.M.E., Obrecht, A., Mainberger, O., Vernet, R., Arcay, H., Schorr, B., Weibel, S., Walther, S., van Harten, P.N., Waddington, J.L., Cuesta, M.J., Peralta, V., Dupin, L., Sambataro, F., Morrens, M., Kubera, K.M., Pieters, L.E., Stegmayer, K., Strik, W., Wolf, R.C., Jabs, B.E., Ams, M., Garcia, C., Hanke, M., Elowe, J., Bartsch, A., Berna, F., Hirjak, D., Foucher, J.R., Foucher, J.R., Jeanjean, L.C., de Billy, C.C., Pfuhlmann, B., Clauss, J.M.E., Obrecht, A., Mainberger, O., Vernet, R., Arcay, H., Schorr, B., Weibel, S., Walther, S., van Harten, P.N., Waddington, J.L., Cuesta, M.J., Peralta, V., Dupin, L., Sambataro, F., Morrens, M., Kubera, K.M., Pieters, L.E., Stegmayer, K., Strik, W., Wolf, R.C., Jabs, B.E., Ams, M., Garcia, C., Hanke, M., Elowe, J., Bartsch, A., Berna, F., and Hirjak, D.

Abstract

Current classification systems use the terms "catatonia" and "psychomotor phenomena" as mere a-theoretical descriptors, forgetting about their theoretical embedment. This was the source of misunderstandings among clinicians and researchers of the European collaboration on movement and sensorimotor/psychomotor functioning in schizophrenia and other psychoses or ECSP. Here, we review the different perspectives, their historical roots and highlight discrepancies.In 1844, Wilhelm Griesinger coined the term "psychic-motor" to name the physiological process accounting for volition. While deriving from this idea, the term "psychomotor" actually refers to systems that receive miscellaneous intrapsychic inputs, convert them into coherent behavioral outputs send to the motor systems. More recently, the sensorimotor approach has drawn on neuroscience to redefine the motor signs and symptoms observed in psychoses.In 1874, Karl Kahlbaum conceived catatonia as a brain disease emphasizing its somatic - particularly motor - features. In conceptualizing dementia praecox Emil Kraepelin rephrased catatonic phenomena in purely mental terms, putting aside motor signs which could not be explained in this way. Conversely, the Wernicke-Kleist-Leonhard school pursued Kahlbaum's neuropsychiatric approach and described many new psychomotor signs, e.g. parakinesias, Gegenhalten. They distinguished 8 psychomotor phenotypes of which only 7 are catatonias. These barely overlap with consensus classifications, raising the risk of misunderstanding.Although coming from different traditions, the authors agreed that their differences could be a source of mutual enrichment, but that an important effort of conceptual clarification remained to be made. This narrative review is a first step in this direction. (C) 2021 Published by Elsevier B.V.

Published
2022

9. Contributor contact details

Author

Vainos, Nikolaos A., primary, Eason, Robert W., additional, May-Smith, Timothy C., additional, Sloyan, Katherine, additional, Gazia, Rossana, additional, Darby, Mark, additional, Sposito, Alberto, additional, Medvid’, Artur, additional, Zhao, Quan-Zhong, additional, Fourkas, John T., additional, Schmidt, Volker, additional, Athanasekos, Loukas, additional, Vainos, Nikolaos A., additional, Pispas, Stergios, additional, Wang, Changhai H., additional, Canning, John, additional, Bandyopadhyay, Somnath, additional, Ams, M., additional, Little, D.J., additional, Withford, M.J., additional, Eaton, Shane M., additional, Osellame, Roberto, additional, Cerullo, Giulio, additional, and Pissadakis, Stavros, additional

Published
2012
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13. 3D Photonics in the Mid-infrared: Parametric study of ultrafast laser inscribed waveguides for stellar interferometry

Author

Arriola, A., primary, Gross, S., additional, Ams, M., additional, Gretzinger, T., additional, Le Coq, D., additional, Wang, R., additional, Ebendorff-Heidepriem, H., additional, Sanghera, J., additional, Bayya, S., additional, Shaw, L. B., additional, Ireland, M., additional, Tuthill, P., additional, and Withford, M., additional

Published
2016
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16. Fabrication of metal nanoparticles by laser ablation

Author

Sobhan, MA, Ams, M, Withford, MJ, and Goldys, EM

Abstract

Laser ablation (LA) has proven itself as one of the most efficient physical methods for nanofabrication When the ablation is performed in a liquid environment, metallic and semiconductor colloids are produced This technique is usually free of containments, which are generally associated with colloids created using a chemical synthesis method A wide range of size distribution and plasmon-resonant properties have been reported in the literature However, in some cases the role of pulse energy and other processing parameters on the characteristics of laser-ablated gold nanoparticles is contradictory In this chapter we perform a systematic investigation ofthe role of processing parameters on nanoparticle generation. We study the effect of pulse energy, focusing conditions, exposure time, and pulse repetition frequency on the characteristics of gold nanoparticles ablated in pure deionised water. In addition, we demonstrate the ability of cetyl trimethylammonium bromide to control the size of the produced particles. Further studies on the stability of these gold nanoparticles were carried out in ambient laboratory conditions for two months. © 2011 by Pan Stanford Publishing Pte. Ltd. All rights reserved.

Published
2011

20. Direct writing of planar lightwave devices using ultrafast lasers

Author

Marshall, GD, Ams, M, Little, D, Jovanovic, N, Fuerbach, A, Dekker, P, Rahmani, A, Dawes, JM, Piper, JA, Withford, MJ, Marshall, GD, Ams, M, Little, D, Jovanovic, N, Fuerbach, A, Dekker, P, Rahmani, A, Dawes, JM, Piper, JA, and Withford, MJ

Abstract

Ultrafast laser direct write micro-fabrication has emerged as a significant enabling technology creating new opportunities in microphotonics. The talk will present recent results of the performance of laser written microphotonic componentry in bulk glasses.

Published
2007

21. Starlight demonstration of the Dragonfly instrument: an integrated photonic pupil-remapping interferometer for high-contrast imaging

Author

Jovanovic, N., primary, Tuthill, P. G., additional, Norris, B., additional, Gross, S., additional, Stewart, P., additional, Charles, N., additional, Lacour, S., additional, Ams, M., additional, Lawrence, J. S., additional, Lehmann, A., additional, Niel, C., additional, Robertson, J. G., additional, Marshall, G. D., additional, Ireland, M., additional, Fuerbach, A., additional, and Withford, M. J., additional

Published
2012
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23. Challenges in photonic pupil remapping for optical stellar interferometry

Author

Norris, B., primary, Jovanovic, N., additional, Tuthill, P. G., additional, Lacour, S., additional, Gross, S., additional, Ams, M., additional, Stewart, P., additional, Lawrence, J., additional, Charles, N., additional, Marshall, G., additional, Robertson, G., additional, Ireland, M., additional, and Withford, M., additional

Published
2011
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27. Integrated waveguide lasers

Author

Fuerbach, A., primary, Gross, S., additional, Ams, M., additional, Koehler, W., additional, Marshall, G., additional, Miese, C., additional, Dekker, P., additional, Lancaster, D., additional, and Withford, M., additional

Published
2011
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29. Dragonfly: On-chip pupil remapping for optical stellar interferometry

Author

Jovanovic, N., primary, Tuthill, P. G., additional, Lacour, S., additional, Ams, M., additional, Gross, S., additional, Norris, B., additional, Stewart, P., additional, Lawrence, J., additional, Lehmann, A., additional, Niel, C., additional, Charles, N., additional, Marshall, G., additional, Robertson, G., additional, Ireland, M., additional, and Withford, M., additional

Published
2011
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47. Fabricating waveguide Bragg gratings (WBGs) in bulk materials using ultrashort laser pulses

Author

Ams Martin, Dekker Peter, Gross Simon, and Withford Michael J.

Subjects
ultrafast, laser, waveguide, bragg, grating, Physics, QC1-999
Abstract

Optical waveguide Bragg gratings (WBGs) can be created in transparent materials using femtosecond laser pulses. The technique is conducted without the need for lithography, ion-beam fabrication methods, or clean room facilities. This paper reviews the field of ultrafast laser-inscribed WBGs since its inception, with a particular focus on fabrication techniques, WBG characteristics, WBG types, and WBG applications.

Published
2017
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48. A practical methodology to assess corrosion in concrete sewer pipes

Author

Taheri Shima, Ams Martin, Bustamante Heriberto, Vorreiter Louisa, Withford Michael, and Martin Clark Simon

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

The combination of Neutron Tomography (NT), Scanning Electron Microscopy (SEM, with and without elemental analysis), pH profiling and Microindentation Mapping techniques was used to develop a methodology for the assessment of concrete sewer pipe deterioration. We demonstrate a viable method for health monitoring of concrete sewer pipes and the evaluation of competing mitigation strategies.

Published
2018
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