Results 1 to 10 of about 139,792 (264)
Optimization of Optical Phase Profile in Beam Deflector with Advanced Simulation Method for High Diffraction Efficiency [PDF]
Micromachines, 2022 Controlling the phase of light with a high efficiency and precision is essential for applications in imaging, tunable devices, and optical systems. Spatial light modulators (SLMs) based on liquid crystals (LCs) have been regarded as one of the best ...
Andrey Manko +5 more
doaj +2 more sources
Dispersion-engineered metasurfaces reaching broadband 90% relative diffraction efficiency [PDF]
Nature Communications, 2023 Dispersion results from the variation of index of refraction as well as electric field confinement in sub-wavelength structures. It usually results in efficiency decrease in metasurface components leading to troublesome scattering into unwanted ...
Wei Ting Chen +5 more
doaj +2 more sources
Diffraction efficiency of strong volume holograms [PDF]
Optics Letters, 1990 We investigate the diffraction efficiency of strong volume holograms in which the coupling parameter is several times that needed for maximum diffraction efficiency. We discuss the implications of our findings on photorefractive implementations of various neural network systems.
John H Hong +2 more
exaly +3 more sources
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
doaj +1 more source
Broadband and Efficient Diffraction [PDF]
Advanced Optical Materials, 2013 Surface topography dictates the deterministic functionality of diffraction by a surface. In order to maximize the efficiency with which a diffractive optical component, such as a grating or a diffractive lens, directs light into a chosen order of diffraction, it is necessary that it be "blazed".
Ribot, Céline +8 more
openaire +3 more sources
Improvement in the diffraction efficiency of a polymer using an ionic liquid [PDF]
Journal of the Serbian Chemical Society, 2018 In this paper, photosensitive materials for information storage devices are presented. The polymers were prepared using surface relief-grating (SRG) fabrication with a diode-pumped solid-state (DPSS) laser of 532 nm, and the diffraction efficiency (DE ...
Kim Sung Ho, Attri Pankaj, Kim In Tae
doaj +1 more source
Design of Semiconductor Contact Grating Terahertz Source with Enhanced Diffraction Efficiency
Crystals, 2022 We report a semiconductor contact grating terahertz source design based on a rectangular profile for phase-matched terahertz generation in the long infrared pump wavelength range. The calculations show that the best diffraction efficiency can be achieved
Zoltán Tibai +4 more
doaj +1 more source
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.
M, Kuittinen, H P, Herzig
openaire +2 more sources
Nanomaterials, 2022 Diffraction gratings are becoming increasingly widespread in optical applications, notably in lasers. This study presents the work on the characterization and evaluation of Multilayer Dielectric Diffraction Gratings (MDG) based on the finite element ...
Duy Thanh Cu +5 more
doaj +1 more source
Design and Fabrication of Silicon-Blazed Gratings for Near-Infrared Scanning Grating Micromirror
Micromachines, 2022 Blazed gratings are the critical dispersion elements in spectral analysis instruments, whose performance depends on structural parameters and topography of the grating groove.
Sinong Zha +4 more
doaj +1 more source