Results 31 to 40 of about 583,984 (377)
Fabricating waveguide Bragg gratings (WBGs) in bulk materials using ultrashort laser pulses
Nanophotonics, 2017 Optical waveguide Bragg gratings (WBGs) can be created in transparent materials using femtosecond laser pulses. The technique is conducted without the need for lithography, ion-beam fabrication methods, or clean room facilities.
Ams Martin +3 more
doaj +1 more source
High-efficiency grating-couplers: demonstration of a new design strategy
Scientific Reports, 2017 We present a simple and practical strategy that allows to design high-efficiency grating couplers. The technique is based on the simultaneous apodization of two structural parameters: the grating period and the fill-factor, along with the optimization of
R. Marchetti +8 more
semanticscholar +1 more source
Biosensors, 2021 Guided-mode resonance (GMR) sensors are widely used as biosensors with the advantages of simple structure, easy detection schemes, high efficiency, and narrow linewidth. However, their applications are limited by their relatively low sensitivity (
Chengrui Zhang +5 more
doaj +1 more source
Reflectionless grating coupling for silicon-on-insulator integrated circuits [PDF]
, 2011 We propose a novel grating coupler design which is inherently reflectionless by focusing the reflected light away from the entrance waveguide.
Baets, Roel +6 more
core +1 more source
Fabrication of X-ray Gratings for Interferometric Imaging by Conformal Seedless Gold Electroplating
Micromachines, 2021 We present a method to produce small pitch gratings for X-ray interferometric imaging applications, allowing the phase sensitivity to be increased and/or the length of the laboratory setup to be minimized.
Konstantins Jefimovs +7 more
doaj +1 more source
Binary Amplitude Reflection Gratings for X-ray Shearing and Hartmann Wavefront Sensors
Sensors, 2021 New, high-coherent-flux X-ray beamlines at synchrotron and free-electron laser light sources rely on wavefront sensors to achieve and maintain optimal alignment under dynamic operating conditions. This includes feedback to adaptive X-ray optics.
Kenneth A. Goldberg +2 more
doaj +1 more source
Extremely asymmetrical scattering of electromagnetic waves in gradually varying periodic arrays [PDF]
, 1999 This paper analyses theoretically and numerically the effect of varying grating amplitude on the extremely asymmetrical scattering (EAS) of bulk and guided optical modes in non-uniform strip-like periodic Bragg arrays with stepwise and gradual variations
Gramotnev, D. K., Nieminen, T. A.
core +2 more sources
Fabrication and Diffraction Efficiency of a Large-format, Replicated X-Ray Reflection Grating
Astrophysical Journal, 2018 We present the methodology used to fabricate an X-ray reflection grating and describe a technique for grating replication. Further, we present the experimental procedure and results of a study to measure the diffraction efficiency of a replicated X-ray ...
D. Miles +9 more
semanticscholar +1 more source
Micromachines, 2019 In this paper, we proposed near-infrared spectroscopy based on a Si photodetector equipped with a gold grating and extended the measurable wavelength range to cover 1200−1600 nm by improving a spectrum derivation procedure.
Yu Suido +4 more
doaj +1 more source