Results 21 to 30 of about 378,095 (341)
Encoding of efficient diffractive microlenses [PDF]
Optics Letters, 1995 Different coding schemes for diffractive multilevel microlenses are compared. A simple method to code a lens to get the optimum diffraction efficiency is given. Furthermore, a straightforward way to estimate the achievable efficiency of a lens is presented.
Kuittinen, Markku, Herzig, Hans-Peter
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Crystals, 2022 We present a process flow for wafer-scale fabrication of a surface phase grating with sub-micron feature sizes from a single semiconductor material. We demonstrate this technique using a 110-oriented GaP semiconductor wafer with second-order nonlinearity
Mohammad Bashirpour +3 more
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Regimes of atomic diffraction: Raman versus Bragg diffraction in retroreflective geometries [PDF]
, 2020 We provide a comprehensive study of atomic Raman and Bragg diffraction when coupling to a pair of counterpropagating light gratings (double diffraction) or to a single one (single diffraction) and discuss the transition from one case to the other in a ...
Abend, Sven +6 more
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Analytic Design of Segmented Phase Grating for Optical Sensing in High-Precision Alignment System
Sensors, 2021 Ultra-precision measurement systems are important for semiconductor manufacturing processes. In a phase grating sensing alignment (PGA) system, the measurement accuracy largely depends on the intensity of the diffraction signal and its signal-to-noise ...
Guanghua Yang +4 more
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Crystals, 2020 A series of photopolymers based on ethylene glycol phenyl ethyl arylate (EGPEA) monomers and poly(methyl methacrylate) (PMMA) matrix with varying initiator concentrations and sample thicknesses have been synthesized and their optical performance ...
Fang-Yong Lee +3 more
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Efficient diffractive phase optics for electrons [PDF]
New Journal of Physics, 2014 Electron diffraction gratings can be used to imprint well-defined phase structure onto an electron beam. For example, diffraction gratings have been used to prepare electron beams with unique phase dislocations, such as electron vortex beams, which hold promise for the development of new imaging and spectroscopy techniques for the study of materials ...
Amit Agrawal +6 more
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Spectral and angular dependence of the efficiency of a two-layer and single-relief sawtooth microstructure [PDF]
Компьютерная оптика, 2018 Spectral and angular dependences of the diffraction efficiency of two-layer single-relief sawtooth microstructures are analyzed. The microstructures are assembled from optical plastics and new brands of special optical glass.
Grigoriy Greisukh +4 more
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Gels, 2023 The role of volume hydrogel holographic gratings as optical transducers in sensor devices for point-of-care applications is increasing due to their ability to be functionalized for achieving enhanced selectivity.
Paola Zezza +4 more
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Photonics, 2023 In this study, novel recommendations are presented and substantiated for selecting the number of modes and optical thicknesses of flat lattice slabs that make up microreliefs, which minimize the computational complexity of the rigorous coupled-wave ...
Grigoriy I. Greisukh +4 more
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Design of a Hybrid Refractive/Diffractive Lens System for Broadband UV
Sensors, 2022 Traditional broadband UV optical designs often have complex structural problems and cannot meet the current requirements of light and miniaturization.
Yuan Hu, Jiaqi Huo, Binpeng Cheng
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