scispace - formally typeset
Search or ask a question
Topic

Diffraction efficiency

About: Diffraction efficiency is a research topic. Over the lifetime, 10320 publications have been published within this topic receiving 158298 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a study of the dependence of diffraction efficiency of the grating formed on various parameters is presented, and the surface structure of the relief gratings has been investigated by atomic force microscopy.

42 citations

Journal ArticleDOI
TL;DR: Results of the computer simulations show that the presented method demonstrates a reduced focal spot size and low sidelobes in a focal domain, within a considerable range of defocusing distances.
Abstract: The depth of focus of the Gaussian beam is extended by introducing a wavefront phase correction with properly designed diffractive optical elements. Results of the computer simulations show that, compared with other methods, the presented method demonstrates a reduced focal spot size and low sidelobes in a focal domain, within a considerable range of defocusing distances. Experimental results for the visible range diffractive optical element with a focus of 40mm and a depth of focus that extends to 1mm agree with the theory.

42 citations

Journal ArticleDOI
TL;DR: In this article, the X-ray Bragg diffraction analysis of periodic surface gratings on (100) GaAs crystals has been performed to determine the grating period, width of the grooves and the quality of the sidewall.
Abstract: We report on the X-ray Bragg diffraction analysis of periodic surface gratings on (100) GaAs crystals. We show that the X-ray Bragg diffraction is a very powerful method to investigate ultrafine surface gratings and allow us to determine not only the grating period but, in particular, the width of the grooves and to characterize the quality of the sidewalls, which is not easily possible with optical methods. The X-ray diffraction on surface crystal gratings is analogue to the Fraunhofer diffraction of multiple slits or reflection gratings.

42 citations

Journal ArticleDOI
TL;DR: In this paper, a rigorous analysis based on the extinction theorem is presented to study anomalous resonant effects from single-layer and multilayer-overcoated, low-efficiency diffraction gratings.
Abstract: A rigorous analysis based on the extinction theorem is presented to study anomalous resonant effects from single-layer- and multilayer-overcoated, low-efficiency diffraction gratings. Anomalously high diffraction efficiency at resonance results from the coupling of the incident beam into guided waves that can be propagated within the composite structure. This analysis incorporates a recursive or R-matrix propagation algorithm that is numerically stable, and the results agree favorably with both experimental and other theoretical research. Numerical results are presented to investigate the influence of certain parameters (i.e., groove depth and shape and the number of high- and low-index overlayers) on the diffraction efficiency at resonance. In the analysis a wavelength of 0.6328 μm and a grating period of 0.7 μm were chosen so that only a −1 diffracted order and the specular beam are reflected from the gratings. Perfect transfer of the grating relief to the film boundaries does not occur in all instances; it depends on the grating and film characteristics, together with the conditions during deposition. We investigate the effect of nonreplication of the grating profile at film interfaces on anomalous diffraction. For the cases studied, it is found that nonreplication has the effect of reducing the strength of the resonant outcoupling. Incident beams with a Gaussian intensity profile are also considered. This effect is accomplished by having multiple incident beams weighted such that their superposition forms a Gaussian envelope. Numerical results show the effect of guided-wave resonances for which distortion of the reflected envelopes is seen.

42 citations

Journal ArticleDOI
TL;DR: In this article, a new method was proposed for the study of lamellar gratings in electromagnetic theory, which is related to a method recently proposed by Australian authors for the case of Littrow mounts, and the present authors first recall the principle of this method and make some theoretical comments.
Abstract: This paper is related to a new method recently proposed by Australian authors for the study of lamellar gratings in electromagnetic theory. The present authors first recall the principle of this method and make some theoretical comments. Then they describe how numerical difficulties which appear in normal incidence and in Littrow mounts can be overcome.

42 citations


Network Information
Related Topics (5)
Optical fiber
167K papers, 1.8M citations
89% related
Plasmon
32.5K papers, 983.9K citations
88% related
Raman scattering
38.4K papers, 902.6K citations
88% related
Laser
353.1K papers, 4.3M citations
86% related
Polarization (waves)
65.3K papers, 984.7K citations
84% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202391
2022188
2021167
2020223
2019259
2018259