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Laplace metasurfaces for optical analog computing based on quasi-bound states in the continuum 被引量:3
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作者 danping pan LEI WAN +6 位作者 MIN OUYANG WEI ZHANG ALEXANDER A.POTAPOV WEIPING LIU ZIXIAN LIANG TIANHUA FENG ZHAOHUI LI 《Photonics Research》 SCIE EI CAS CSCD 2021年第9期1758-1766,共9页
Laplace operation,the isotropic second-order differentiation,on spatial functions is an essential mathematical calculation in most physical equations and signal processing.Realizing the Laplace operation in a manner o... Laplace operation,the isotropic second-order differentiation,on spatial functions is an essential mathematical calculation in most physical equations and signal processing.Realizing the Laplace operation in a manner of optical analog computing has recently attracted attention,but a compact device with a high spatial resolution is still elusive.Here,we introduce a Laplace metasurface that can perform the Laplace operation for incident lightfield patterns.By exciting the quasi-bound state in the continuum,an optical transfer function for nearly perfect isotropic second-order differentiation has been obtained with a spatial resolution of wavelength scale.Such a Laplace metasurface has been numerically validated with both 1D and 2D spatial functions,and the results agree well with that of the ideal Laplace operation.In addition,the edge detection of a concerned object in an image has been demonstrated with the Laplace metasurface.Our results pave the way to the applications of metasurfaces in optical analog computing and image processing. 展开更多
关键词 SURFACE QUASI CONTINUUM
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Investigation on the relationship between the fine particle emission and crystallization characteristics of gypsum during wet flue gas desulfurization process 被引量:9
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作者 danping pan Hao Wu Linjun Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第5期303-310,共8页
The relationship between the fine particles emitted after desulfurization and gypsum crystals in the desulfurization slurry was investigated,and the crystallization characteristics varying with the operation parameter... The relationship between the fine particles emitted after desulfurization and gypsum crystals in the desulfurization slurry was investigated,and the crystallization characteristics varying with the operation parameters and compositions of the desulfurization slurry were discussed.The results showed that the fine particles generated during the desulfurization process were closely related to the crystal characteristics in the desulfurization slurry by comparison of their morphology and elements. With the higher proportion of fine crystals in the desulfurization slurry,the number concentration of fine particles after desulfurization was increased and their particle sizes were smaller,indicating that the optimization of gypsum crystallization was beneficial for the reduction of the fine particle emission. The lower p H value and an optimal temperature of the desulfurization slurry were beneficial to restrain the generation of fine crystals in the desulfurization slurry. In addition,the higher concentrations of the Fe3+ions and the F- ions in the desulfurization slurry both promoted the generation of fine crystals with corresponding change of the morphology and the effect of the Fe3+ ions was more obvious.With the application of the desulfurization synergist additive,it was beneficial for the inhibition of fine crystals while the thinner crystals were generated. 展开更多
关键词 Wet flue gas desulfurization Fine particle Gypsum crystallization Emission
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A review of dielectric optical metasurfaces for spatial differentiation and edge detection 被引量:1
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作者 Lei WAN danping pan +2 位作者 Tianhua FENG Weiping LIU Alexander A.POTAPOV 《Frontiers of Optoelectronics》 EI CSCD 2021年第2期187-200,共14页
Dielectric metasurfaces-based planar optical spatial differentiator and edge detection have recently been proposed to play an important role in the parallel and fast image processing technology.With the development of... Dielectric metasurfaces-based planar optical spatial differentiator and edge detection have recently been proposed to play an important role in the parallel and fast image processing technology.With the development of dielectric metasurfaces of different geometries and resonance mechanisms,diverse on-chip spatial differentiators have been proposed by tailoring the dispersion characteristics of subwavelength structures.This review focuses on the basic principles and characteristic parameters of dielectric metasurfaces as first-and second-order spatial differentiators realized via the Green's function approach.The spatial bandwidth and polarization dependence are emphasized as key properties by comparing the optical transfer flinctions of metasurfaces for different incident wavevectors and polarizations.To present the operational capabilities of a two-dimensional spatial differentiator in image information acquisition,edge detection is described to illustrate the practicability of the device.As an application example,experimental demonstrations of edge detection for different biological cells and a flower mold are discussed,in which a spatial differentiator and objective lens or camera are integrated in three optical pathway configurations.The realization of spatial differentiators and edge detection with dielectric metasurfaces provides new opportunities for ultrafast information identification in biological imaging and machine vision. 展开更多
关键词 dielectric metasurfaces spatial differentiator edge detection optical transfer function
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