Results 51 to 60 of about 43,891 (214)
Stretchable diffraction gratings for spectrometry
Optics Express, 2007 We have investigated the possibility of using transparent stretchable diffraction gratings for spectrometric applications. The gratings were fabricated by replication of a triangular-groove master into a transparent viscoelastic. The sample length, and hence the spatial period, can be reversibly changed by mechanical stretching.
Simonov, A.N. (author) +2 more
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A Study on Length Traceability and Diffraction Efficiency of Chromium Gratings
PhotonicsMeasurement traceability is a prerequisite for achieving accurate and reliable results as well as technical standardization. The period of Chromium (Cr) gratings fabricated by atomic lithography can be directly traced back to natural constants.
Lihua Lei +8 more
doaj +1 more source
Large bandwidth, highly efficient optical gratings through high index materials [PDF]
, 2008 We analyze the diffraction characteristics of dielectric gratings that feature a high index grating layer, and devise, through rigorous numerical calculations, large bandwidth, highly efficient, high dispersion dielectric gratings in reflection, transmission, and immersed transmission geometry. A dielectric TIR grating is suggested, whose -1dB spectral
arxiv +1 more source
A modal model for diffraction gratings [PDF]
Journal of Modern Optics, 2003 A description of an algorithm for a rather general modal grating calculation is presented. Arbitrary profiles, depth, and permittivity are allowed. Gratings built up from sub-gratings are allowed, as are coatings on the sidewalls of lines, and arbitrary complex structure. Conical angles and good conductors are supported.
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Crystals, 2023 We describe an all-optical method to achieve—prior to further advanced processing steps—a perfect match of the relevant wavelength-sensitive parameters of an InGaN/GaN semiconductor distributed feedback laser.
Daniel Hofstetter +2 more
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Electrically Tunable Diffraction Grating Based on Liquid Crystals
Advances in Condensed Matter Physics, 2018 A periodic electric field is generated in the grating-like electrodes cell by an applied voltage and results in the reorientation of liquid crystals. The linearly polarized probe beam experienced periodic distribution of refractive index and formed a ...
Chuen-Lin Tien +3 more
doaj +1 more source
Measurement of atomic diffraction phases induced by material gratings [PDF]
, 2005 Atom-surface interactions can significantly modify the intensity and phase of atom de Broglie waves diffracted by a silicon nitride grating. This affects the operation of a material grating as a coherent beam splitter. The phase shift induced by diffraction is measured by comparing the relative phases of serveral interfering paths in a Mach-Zehnder Na ...
arxiv +1 more source
The Physics Teacher, 1973 In the summer of 1972, I attended the workshop on recreating classic experiments in physics at Barnard College.1 This was developed by Samuel Devons, and it was a defining experience that set me toward a research career involving early physics teaching apparatus.
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Design and numerical analysis of metallic Ronchi diffraction gratings acting as reflective beam-splitter [PDF]
Torcal-Milla, F. J., & Sanchez-Brea, L. M. (2022). Design and
numerical analysis of metallic Ronchi diffraction gratings acting as
reflective beam-splitter. Optik, 271, 170119In this work, a reflective beam-splitter based on a metallic Ronchi diffraction grating normally illuminated is designed and analysed. This kind of beam-splitter could have potential applications in photonics and optical technologies in which robustness is necessary since it may be manufactured over malleable metallic substrates.
arxiv +1 more source
Dynamical theory of diffraction on moving grating [PDF]
, 2015 In the framework of the approximation of slowly varying amplitudes a multiwave dynamical theory of neutron diffraction on a moving phase grating was developed. The influence of the velocity of the grating, its period and height of the slits on the discrete energy spectrum and intensity of various diffraction orders was analyzed.
arxiv +1 more source