Topic
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.
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01 Aug 1989TL;DR: A functional optical device is characterized by a plurality of light beams which are polarized in different directions, so that at least part of the incident light beam is subjected to the diffraction effect as discussed by the authors.
Abstract: A functional optical element has at least one diffraction grating in which first and second elements are alternately arranged. At least one of the first and second elements comprises an optically anisotropic substance and the adjacent elements are substantially different from each other. This diffraction grating is so disposed that the arrayed surface of the diffraction grating is located in the path of the incident light beam. The functional optical device is characterized in that an incident light beam having an arbitrary polarization characteristic is functioned as a plurality of light beams which are polarized in the different directions, so that at least part of the incident light beam is subjected to the diffraction effect. The optical condition of at least one of the first and second elements may be varied by a control device.
204 citations
TL;DR: A two-layer structure, which consists of a uniform guiding layer and a grating layer, yielded symmetric, low-sideband resonance that is suitable for narrow-band filter applications.
Abstract: Resonant effects in diffraction from two-dimensional dielectric gratings is demonstrated experimentally. A two-layer structure, which consists of a uniform guiding layer and a grating layer, yielded symmetric, low-sideband resonance that is suitable for narrow-band filter applications. Excellent agreement between measured and calculated spectral and angular dependence is obtained.
204 citations
TL;DR: In this paper, the spectral response of a metallic film with an engraved 2D periodic structure of annular apertures was studied and an enhanced transmission can be obtained and can reach 90%.
202 citations
TL;DR: Rigorous coupled-wave analysis is shown to be an efficient tool for the numerical analysis of aperiodic diffraction problems, including photonic crystal waveguides, Bragg mirrors, and grating couplers, and the domain of applications of grating theories is extended.
Abstract: Rigorous coupled-wave analysis (also called the Fourier-modal method) is an efficient tool for the numerical analysis of grating diffraction problems. We show that, with only a few modifications, this method can be used efficiently for the numerical analysis of aperiodic diffraction problems, including photonic crystal waveguides, Bragg mirrors, and grating couplers. We thus extend the domain of applications of grating theories.
202 citations
TL;DR: In this paper, a time-domain beam propagation method (BPM) based on the finite-element scheme is described for the analysis of reflections of both transverse electric and transverse magnetic polarized pulses in waveguiding structures containing arbitrarily shaped discontinuities.
Abstract: A time-domain beam propagation method (BPM) based on the finite-element scheme is described for the analysis of reflections of both transverse electric and transverse magnetic polarized pulses in waveguiding structures containing arbitrarily shaped discontinuities. In order to avoid nonphysical reflections from the computational window edges, the perfectly matched layer boundary condition is introduced. The present algorithm using the Pade approximation is, to our knowledge, the first time-domain beam propagation method which can treat wide-band optical pulses. After validating this method for an optical grating with modulated refractive indexes, various photonic crystal circuit components are simulated.
201 citations