Pub Date : 2018-11-06DOI: 10.30473/JPHYS.2018.5562
Ensiyeh Mohebbi, Narges Ansari, F. Ghorbani
با (TMDC) لایه هاي دوبعدي ديکالکوجنایدهاي فلزات واسطه گافهاي نواري مستقیم، افق جدیدي در کاربري این مواد در فوتونیک و الکترواپتیک ایجاد کرده است. وجود گاف نواري باعث جذب اپتیکی چشمگیر این لایه ها در دستگاههاي فوتوولتاییک میشود. قرارگیري این لایه ها روي زیرلایه به علت بازتابهاي متوالی، بر طیف جذب اثر و یا ترکیب آنها به عنوان Si یا SiO میگذارد. به طور متداول، از 2 زیرلایه براي این تک لایه ها استفاده میشود. در این مقاله با استفاده از شامل TMDC روش ماتریس انتقال، طیف جذب تک لایههاي و یا Si یا SiO با حضور زیرلایۀ 2 WS و 2 MoS2،WSe2 ،MoSe2 بررسی شد. SiO با ضخامتهاي مختلف لایۀ 2 SiO2/Si دوتایی در زیرلایۀ دوتایی به عنوان ضخامت SiO ضخامت 90 نانومتر لایۀ 2 بهینه انتخاب شد؛ چرا که روند کلی جذب را تغییر نمیدهد و باعث افزایش جذب در بعضی نواحی طول موجی میشود.
{"title":"بررسي اثر ضخامت زيرلايه بر جذب تك لايه هاي TMDC در ناحيه طول موج مرئي","authors":"Ensiyeh Mohebbi, Narges Ansari, F. Ghorbani","doi":"10.30473/JPHYS.2018.5562","DOIUrl":"https://doi.org/10.30473/JPHYS.2018.5562","url":null,"abstract":"با (TMDC) لایه هاي دوبعدي ديکالکوجنایدهاي فلزات واسطه \u0000گافهاي نواري مستقیم، افق جدیدي در کاربري این مواد در فوتونیک \u0000و الکترواپتیک ایجاد کرده است. وجود گاف نواري باعث جذب اپتیکی \u0000چشمگیر این لایه ها در دستگاههاي فوتوولتاییک میشود. قرارگیري این \u0000لایه ها روي زیرلایه به علت بازتابهاي متوالی، بر طیف جذب اثر \u0000و یا ترکیب آنها به عنوان Si یا SiO میگذارد. به طور متداول، از 2 \u0000زیرلایه براي این تک لایه ها استفاده میشود. در این مقاله با استفاده از \u0000شامل TMDC روش ماتریس انتقال، طیف جذب تک لایههاي \u0000و یا Si یا SiO با حضور زیرلایۀ 2 WS و 2 MoS2،WSe2 ،MoSe2 \u0000بررسی شد. SiO با ضخامتهاي مختلف لایۀ 2 SiO2/Si دوتایی \u0000در زیرلایۀ دوتایی به عنوان ضخامت SiO ضخامت 90 نانومتر لایۀ 2 \u0000بهینه انتخاب شد؛ چرا که روند کلی جذب را تغییر نمیدهد و باعث \u0000افزایش جذب در بعضی نواحی طول موجی میشود.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"1 1","pages":"51-56"},"PeriodicalIF":0.0,"publicationDate":"2018-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82612236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-09-23DOI: 10.1142/9789812701473_0025
J. Retter, A. Varon, D. Cl'ement, M. Hugbart, P. Bouyer, L. Sanchez-Palencia, D. Gangardt, G. Shlyapnikov, A. Aspect
J. A. RETTER, A. F. VARON, D. CLEMENT, M. HUGBART, P. BOUYER, L. SANCHEZ-PALENCIA, D. GANGARDT, G. V. SHLYAPNIKOV, AND A. ASPECT Laboratoire Charles Fabry de l’Institut d’Optique, Universite Paris-Sud XI, 91403 Orsay cedex, France. Laboratoire de Physique Theorique et Modeles Statistiques, Universite Paris-Sud XI, 91405 Orsay cedex, France. Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65/67, 1018 XE Amsterdam, The Netherlands.
{"title":"Inhibition of the transport of a Bose-Einstein condensate in a 1D random potential","authors":"J. Retter, A. Varon, D. Cl'ement, M. Hugbart, P. Bouyer, L. Sanchez-Palencia, D. Gangardt, G. Shlyapnikov, A. Aspect","doi":"10.1142/9789812701473_0025","DOIUrl":"https://doi.org/10.1142/9789812701473_0025","url":null,"abstract":"J. A. RETTER, A. F. VARON, D. CLEMENT, M. HUGBART, P. BOUYER, L. SANCHEZ-PALENCIA, D. GANGARDT, G. V. SHLYAPNIKOV, AND A. ASPECT Laboratoire Charles Fabry de l’Institut d’Optique, Universite Paris-Sud XI, 91403 Orsay cedex, France. Laboratoire de Physique Theorique et Modeles Statistiques, Universite Paris-Sud XI, 91405 Orsay cedex, France. Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65/67, 1018 XE Amsterdam, The Netherlands.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"88 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2005-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76782819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A segmented silicon detector has been developed for the Stony Brook soft x-ray scanning transmission x-ray microscope. The detector combines good detective quantum efficiency (90% at 520 e' and low noise (5 photons/ channel/ integration at 520 eV) with the ability of having up to 10 independent sensitive regions that are matched to the microscope geometry. In addition to the usual bright field images, differential phase contrast images and dark field images are recorded simultaneously in one scan. A Fourier filtering method has been employed to recover an estimate of the sample absorption and phase shift from the partially coherent images collected on the detector segments. 'A reconstruction of a Germanium test pattern exhibits good agreement between the predictions from the tabulated x-ray optical constants and the experiment.
{"title":"SCANNING TRANSMISSION X-RAY MICROSCOPY WITH A SEGMENTED DETECTOR","authors":"M. Feser, C. Jacobsen, P. Řehák, G. Degeronimo","doi":"10.1051/jp4:20030138","DOIUrl":"https://doi.org/10.1051/jp4:20030138","url":null,"abstract":"A segmented silicon detector has been developed for the Stony Brook soft x-ray scanning transmission x-ray microscope. The detector combines good detective quantum efficiency (90% at 520 e' and low noise (5 photons/ channel/ integration at 520 eV) with the ability of having up to 10 independent sensitive regions that are matched to the microscope geometry. In addition to the usual bright field images, differential phase contrast images and dark field images are recorded simultaneously in one scan. A Fourier filtering method has been employed to recover an estimate of the sample absorption and phase shift from the partially coherent images collected on the detector segments. 'A reconstruction of a Germanium test pattern exhibits good agreement between the predictions from the tabulated x-ray optical constants and the experiment.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2003-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80287899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. Morrison, W. Eaton, R. Barrett, P. Charalambous
The use of a segmented, transmitted-x-ray detector in the scanning transmission x-ray microscope (STXM) allows a number of different image modes to be realised simultaneously, from a single scan of the specimen. A software-configurable detector system that is based on an 80x80-element CCD array has been tested using the STXM on ID21 at the ESRF. The whole CCD sub-system is controlled by software running on a PC, which handles the synchronisation of image data collection with the raster scan of the STXM, and returns a real-time image signal to the STXM control system, while storing a 3-D set of image data locally on the detector control PC. The readout electronics allow full CCD frames to be recorded in under 10ms for each pixel in the STXM image, so there is no significant time penalty associated with the collection of such a large volume of image data, when compared to STXM imaging with a single-element detector. Subsequent processing allows any appropriate image signals to be synthesised, and the user can quickly be presented with absorption, phase contrast, and darkfield images, all in perfect registration, to facilitate a rapid quantitative interpretation of the sample structure.
{"title":"STXM imaging with a configured detector","authors":"G. Morrison, W. Eaton, R. Barrett, P. Charalambous","doi":"10.1051/JP4:20030141","DOIUrl":"https://doi.org/10.1051/JP4:20030141","url":null,"abstract":"The use of a segmented, transmitted-x-ray detector in the scanning transmission x-ray microscope (STXM) allows a number of different image modes to be realised simultaneously, from a single scan of the specimen. A software-configurable detector system that is based on an 80x80-element CCD array has been tested using the STXM on ID21 at the ESRF. The whole CCD sub-system is controlled by software running on a PC, which handles the synchronisation of image data collection with the raster scan of the STXM, and returns a real-time image signal to the STXM control system, while storing a 3-D set of image data locally on the detector control PC. The readout electronics allow full CCD frames to be recorded in under 10ms for each pixel in the STXM image, so there is no significant time penalty associated with the collection of such a large volume of image data, when compared to STXM imaging with a single-element detector. Subsequent processing allows any appropriate image signals to be synthesised, and the user can quickly be presented with absorption, phase contrast, and darkfield images, all in perfect registration, to facilitate a rapid quantitative interpretation of the sample structure.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"154 ","pages":"547-550"},"PeriodicalIF":0.0,"publicationDate":"2003-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91464661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
B. Kaulich, D. Bacescu, D. Cocco, J. Susini, M. Salomé, O. Dhez, C. David, T. Weitkamp, E. Fabrizio, S. Cabrini, G. Morrison, P. Charalambous, J. Thieme, T. Wilhein, J. Kovac, M. Podnar, M. Kiskinova
The two types of X-ray microscopes, scanning and full-field imaging, have different but complementary capabilities in term of image acquisition and spectroscopies. The novel approach used for the first time in the EU RT&D project Twinmic (HPRI-CT-2001-50024) aims at building of a multipurpose end-station combining scanning and full-field imaging microscopes with easy switch between the two modes. The twin microscope is expected to achieve the state-of-art performance of both microscopy modes in fast imaging, tomography and spectroscopy (μ-XANES/XRF), allowing new class of experiments in exploration of heterogeneous phenomena of the matter at mesoscopic length scales.
{"title":"Twinmic: A European twin microscope station combining full-field imaging and scanning microscopy","authors":"B. Kaulich, D. Bacescu, D. Cocco, J. Susini, M. Salomé, O. Dhez, C. David, T. Weitkamp, E. Fabrizio, S. Cabrini, G. Morrison, P. Charalambous, J. Thieme, T. Wilhein, J. Kovac, M. Podnar, M. Kiskinova","doi":"10.1051/JP4:200300039","DOIUrl":"https://doi.org/10.1051/JP4:200300039","url":null,"abstract":"The two types of X-ray microscopes, scanning and full-field imaging, have different but complementary capabilities in term of image acquisition and spectroscopies. The novel approach used for the first time in the EU RT&D project Twinmic (HPRI-CT-2001-50024) aims at building of a multipurpose end-station combining scanning and full-field imaging microscopes with easy switch between the two modes. The twin microscope is expected to achieve the state-of-art performance of both microscopy modes in fast imaging, tomography and spectroscopy (μ-XANES/XRF), allowing new class of experiments in exploration of heterogeneous phenomena of the matter at mesoscopic length scales.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"36 1","pages":"103-107"},"PeriodicalIF":0.0,"publicationDate":"2003-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75986685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. K. Powell, Z. Laczik, S. Pfauntsch, D. Chana, A. Michette
The use of pupil plane phase masks provides a useful and efficient method of manipulating focal region light distributions. Such masks have found application in the telecommunication sector, including the use of Fourier plane replicating holograms for weighted beamlet array generation for the addressing of optoelectronic devices. Rather than modifying the focal pattern at the focal plane, the through focus intensity distribution may also be controlled with an appropriately designed phase mask. In a high numerical aperture optical system, as is used for laser generated plasma X-ray sources, such phase mask can extend the depth of focus of the irradiating laser beam, to achieve more uniform plasma heating and consequently, a better shot-to-shot repeatability from the X-ray source.
{"title":"Wavefront shaping optics for laser-generated plasma heating","authors":"A. K. Powell, Z. Laczik, S. Pfauntsch, D. Chana, A. Michette","doi":"10.1051/JP4:200300044","DOIUrl":"https://doi.org/10.1051/JP4:200300044","url":null,"abstract":"The use of pupil plane phase masks provides a useful and efficient method of manipulating focal region light distributions. Such masks have found application in the telecommunication sector, including the use of Fourier plane replicating holograms for weighted beamlet array generation for the addressing of optoelectronic devices. Rather than modifying the focal pattern at the focal plane, the through focus intensity distribution may also be controlled with an appropriately designed phase mask. In a high numerical aperture optical system, as is used for laser generated plasma X-ray sources, such phase mask can extend the depth of focus of the irradiating laser beam, to achieve more uniform plasma heating and consequently, a better shot-to-shot repeatability from the X-ray source.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"52 1","pages":"127-130"},"PeriodicalIF":0.0,"publicationDate":"2003-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90951346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Michette, P. Prewett, A. K. Powell, S. Pfauntsch, K. Atkinson, B. Boonliang
Advances in the techniques of micro- and nano-fabrication mean that it is now possible to design and make microstructured optical arrays (MOAs). Due to greater flexibility in the choice of channel geometry and layout, these offer much better performances than current grazing incidence optics, which are limited to circular, square or close-packed hexagonal channels. In addition, MOAs can have built-in adaptivity and controllable focal length - they can therefore act as zoom lenses. Potential applications include x-ray microprobing, EUV lithography and confocal x-ray microscopy.
{"title":"Novel microstructured adaptive X-ray optics","authors":"A. Michette, P. Prewett, A. K. Powell, S. Pfauntsch, K. Atkinson, B. Boonliang","doi":"10.1051/JP4:200300080","DOIUrl":"https://doi.org/10.1051/JP4:200300080","url":null,"abstract":"Advances in the techniques of micro- and nano-fabrication mean that it is now possible to design and make microstructured optical arrays (MOAs). Due to greater flexibility in the choice of channel geometry and layout, these offer much better performances than current grazing incidence optics, which are limited to circular, square or close-packed hexagonal channels. In addition, MOAs can have built-in adaptivity and controllable focal length - they can therefore act as zoom lenses. Potential applications include x-ray microprobing, EUV lithography and confocal x-ray microscopy.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"27 1","pages":"277-280"},"PeriodicalIF":0.0,"publicationDate":"2003-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81919863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Schanne-Klein, H. Weisman, A. Gotzendorfer, F. Hache
Nous etudions les proprietes physiques des molecules chirales en etendant les techniques d'optique non-lineaire aux effets chiroptiques pour ainsi mesurer une "activite optique non-lineaire". La generation de second harmonique en surface est particulierement sensible a la chiralite moleculaire, avec des rotations de polarisation du second harmonique et des differences circulaires et lineaires tres importantes. Pour comprendre l'origine physique de ces effets chiroptiques, nous generalisons les principaux modeles microscopiques de chiralite aux effets non-lineaires d'ordre deux et montrons qu'une chiralite a un electron n'a pas la meme signature a l'ordre deux qu'une chiralite par couplage excitonique. Des experiences avec des molecules test pour ces deux types de chiralite montrent un bon accord avec ces modelisations theoriques.
{"title":"Optique non-linéaire et chiralité [Nonlinear optics and chirality]","authors":"M. Schanne-Klein, H. Weisman, A. Gotzendorfer, F. Hache","doi":"10.1051/JP420020099","DOIUrl":"https://doi.org/10.1051/JP420020099","url":null,"abstract":"Nous etudions les proprietes physiques des molecules chirales en etendant les techniques d'optique non-lineaire aux effets chiroptiques pour ainsi mesurer une \"activite optique non-lineaire\". La generation de second harmonique en surface est particulierement sensible a la chiralite moleculaire, avec des rotations de polarisation du second harmonique et des differences circulaires et lineaires tres importantes. Pour comprendre l'origine physique de ces effets chiroptiques, nous generalisons les principaux modeles microscopiques de chiralite aux effets non-lineaires d'ordre deux et montrons qu'une chiralite a un electron n'a pas la meme signature a l'ordre deux qu'une chiralite par couplage excitonique. Des experiences avec des molecules test pour ces deux types de chiralite montrent un bon accord avec ces modelisations theoriques.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"463 1","pages":"77"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79849387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"On the Isotropic-Nematic Transition for Polymers in Liquid Crystals","authors":"L. Balents, R. Kamien, P. Doussal, E. Zaslow","doi":"10.1051/JP1:1992142","DOIUrl":"https://doi.org/10.1051/JP1:1992142","url":null,"abstract":"","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1992-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82403459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the mean field description of the incommensurate transition of quartz, the triangular 3-q, the striped I-q and the fl phases meet at the same critical point. It is shown that critical fluctuations lift this degeneracy and transform the second order transition into first order ones. Furthermore, there is a regime of the parameter space where the I-q phase should appear between the fl and 3-q phases, even in the absence of any applied stress, as seen in recent experiments.
{"title":"Fluctuation effect on the incommensurate transition of quartz","authors":"P. Borckmans, G. Dewel","doi":"10.1051/JP1:1991189","DOIUrl":"https://doi.org/10.1051/JP1:1991189","url":null,"abstract":"In the mean field description of the incommensurate transition of quartz, the triangular 3-q, the striped I-q and the fl phases meet at the same critical point. It is shown that critical fluctuations lift this degeneracy and transform the second order transition into first order ones. Furthermore, there is a regime of the parameter space where the I-q phase should appear between the fl and 3-q phases, even in the absence of any applied stress, as seen in recent experiments.","PeriodicalId":14747,"journal":{"name":"Journal De Physique","volume":"28 1","pages":"1055-1062"},"PeriodicalIF":0.0,"publicationDate":"1991-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83608340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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