Results 301 to 310 of about 6,802,009 (374)
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Enhancement of Diffraction Efficiency Based on the Addition Principle of Coded Digital Gratings
Journal of Lightwave Technology, 2022For the traditional subwavelength gratings, we can code different units to construct the coded metagratings. In this paper, we propose an innovative principle of adding coded gratings, which can be used to add or subtract two or more traditional coded ...
Xufeng Jing +6 more
semanticscholar +1 more source
Laser & Photonics Reviews, 2022
Optical metasurface is a 2D array of subwavelength meta‐atoms that arbitrarily manipulates amplitude, polarization, and wavefront of incident light, offering great advantages in miniaturization and integration.
Di Sang +8 more
semanticscholar +1 more source
Optical metasurface is a 2D array of subwavelength meta‐atoms that arbitrarily manipulates amplitude, polarization, and wavefront of incident light, offering great advantages in miniaturization and integration.
Di Sang +8 more
semanticscholar +1 more source
Hybrid-level Fresnel zone plate for diffraction efficiency enhancement
Optics Express, 2017 The Fresnel Zone Plate (FZP) is widely used in a variety of applications. However, the most concerning drawback of the FZP is its low diffraction efficiency limited by fabrication capability.
Zhiyu Zhang, Ruoqiu Wang, Haixiang Hu
exaly +2 more sources
Efficiency analysis of diffractive lenses
Journal of the Optical Society of America A, 2001Multilevel diffractive optical elements are necessary for achieving high-efficiency performance. Here the diffraction efficiency of a multilevel phase-only diffractive lens is analyzed. Approximate, as well as more accurate, approaches are presented. Both plane-wave and Gaussian illumination are discussed.
U, Levy, D, Mendlovic, E, Marom
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Diffraction efficiency of stepped gratings using high phase-modulation spatial light modulators
, 2020When encoding diffractive optical elements (DOE) onto a spatial light modulator (SLM), the diffraction efficiency can be reduced because of the pixel nature of the SLM.
I. Moreno +5 more
semanticscholar +1 more source
Optics Letters, 2000
The theoretical diffraction efficiency upper limit of diffractive phase elements (DPE's) with finite apertures is investigated. A successful numerical method of evaluating the efficiency upper bound of DPE's is proposed. The method includes a hybrid optimization procedure that combines a genetic algorithm with the conjugate gradient method.
G, Zhou +4 more
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The theoretical diffraction efficiency upper limit of diffractive phase elements (DPE's) with finite apertures is investigated. A successful numerical method of evaluating the efficiency upper bound of DPE's is proposed. The method includes a hybrid optimization procedure that combines a genetic algorithm with the conjugate gradient method.
G, Zhou +4 more
openaire +2 more sources
Diffraction efficiency of random binary-amplitude diffracting screens
Applied Optics, 1994The diffraction characteristics of random binary-amplitude diffracting screens are investigated. It is shown that, for such a random diffracting screen with complex amplitude transmittance t equal to either 0 or 1, the diffraction efficiency of the screen is maximized when 50% of the screen has transmittance t = 1, independent of other characteristics ...
W T, Rhodes, M S, McMeekin
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Advanced Optical Materials, 2019
Periodic surface structures are core components for controlling the dispersion and steering characteristics of light. Here, a mask‐free approach using nonablative femtosecond laser processing is proposed and demonstrated to fabricate extremely long‐range
Ji Huang +11 more
semanticscholar +1 more source
Periodic surface structures are core components for controlling the dispersion and steering characteristics of light. Here, a mask‐free approach using nonablative femtosecond laser processing is proposed and demonstrated to fabricate extremely long‐range
Ji Huang +11 more
semanticscholar +1 more source