Diffraction grating

About: Diffraction grating is a research topic. Over the lifetime, 24884 publications have been published within this topic receiving 372437 citations. The topic is also known as: grating.

High efficiency diffractive grating couplers for interfacing a single mode optical fiber with a nanophotonic silicon-on-insulator waveguide circuit

Abstract: High efficiency diffractive grating structures to interface a single mode optical fiber and a nanophotonic integrated circuit fabricated on silicon-on-insulator are presented The diffractive grating structures are designed to be inherently very directional by adding a silicon overlay before grating definition 55% coupling efficiency at a wavelength of 153μm is experimentally demonstrated on devices fabricated using standard complementary metal-oxide semiconductor technology By optimizing the grating parameters, we theoretically show that 80% grating coupling efficiency can be obtained for a uniform grating structure

Laser‐induced excited state and ultrasonic wave gratings: Amplitude and phase grating contributions to diffraction

Abstract: A detailed analysis of diffraction from laser‐induced gratings is presented. The changes which occur in both the real and imaginary parts of the index of refraction are accounted for when excited states are created. These lead to phase and amplitude grating contributions, respectively, to the diffraction from a laser‐induced excited state grating. Experimental confirmation of the predicted wavelength dependence of these contributions is presented. Diffraction from laser‐induced excited state gratings, ultrasonic wave gratings, and mixed excited state and acoustic gratings is analyzed with the phase and amplitude contributions to each accounted for. The results permit the interpretation of mixed grating data and predict conditions under which density‐dependent absorption spectral shifts and excited state‐phonon interactions can be measured.

Modern developments in X-ray and neutron optics

Abstract: Theoretical Approaches and Calculations.- X-Ray and Neutron Optical Systems.- The BESSY Raytrace Program RAY.- Neutron Beam Phase Space Mapping.- Raytrace of Neutron Optical Systems with RESTRAX.- Wavefront Propagation.- Theoretical Analysis of X-Ray Waveguides.- Focusing Optics for Neutrons.- Volume Effects in Zone Plates.- Nano-Optics Metrology.- Slope Error and Surface Roughness.- The Long Trace Profilers.- The Nanometer Optical Component Measuring Machine.- Shape Optimization of High Performance X-Ray Optics.- Measurement of Groove Density of Diffraction Gratings.- The COST P7 Round Robin for Slope Measuring Profilers.- Hartmann and Shack-Hartmann Wavefront Sensors for Sub-nanometric Metrology.- Extraction of Multilayer Coating Parameters from X-Ray Reflectivity Data.- Refection/Refraction Optics.- Hard X-Ray Microoptics.- Capillary Optics for X-Rays.- Reflective Optical Arrays.- Reflective Optical Structures and Imaging Detector Systems.- CLESSIDRA: Focusing Hard X-Rays Efficiently with Small Prism Arrays.- Multilayer Optics Developments.- Neutron Supermirror Development.- Stress Reduction in Multilayers Used for X-Ray and Neutron Optics.- Multilayers with Ultra-Short Periods.- Specially Designed Multilayers.- Diffraction Optics.- Diffractive-Refractive Optics: X-ray Crystal Monochromators with Profiled Diffracting Surfaces.- Neutron Multiple Reflections Excited in Cylindrically Bent Perfect Crystals and Their Possible use for High-Resolution Neutron Scattering.- Volume Modulated Diffraction X-Ray Optics.- High Resolution 1D and 2D Crystal Optics Based on Asymmetric Diffractors.- Thermal Effects under Synchrotron Radiation Power Absorption.

High-efficiency and fast-response tunable phase grating using a blue phase liquid crystal.

Abstract: We demonstrate a tunable phase grating using a polymer-stabilized blue phase liquid crystal Because of the electric-field-induced rectangularlike phase profile, a high diffraction efficiency of 40% is achieved Moreover, this device shows submillisecond response time The proposed tunable phase grating holds great potential for photonics and display applications

Fiber Bragg gratings for dispersion compensation in transmission: theoretical model and design criteria for nearly ideal pulse recompression

Abstract: We propose a transmission-based dispersion compensator employing an apodized, unchirped fiber Bragg grating (FBG). A theoretical model for dispersion compensation in transmission based on the dispersive properties of the periodic structure is developed. A figure of merit is defined for optimization of the grating parameters for maximum recompression of dispersion-broadened optical pulses in long-haul communication systems. Numerical examples confirm that nearly perfect compensation with very low insertion losses can be achieved for many practical cases of interest.