Two-Dimensional Edge Detection by Guided Mode Resonant Metasurface

Saba, Amirhossein; Tavakol, Mohammad Reza; Karimi-Khoozani, Parisa; Khavasi, Amin

doi:10.1109/lpt.2018.2820045

Cited by 61 publications

(42 citation statements)

References 15 publications

(19 reference statements)

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“…There already exist a few potential application examples about metasurface‐based analog optical spatial devices such as differentiators, integrators, and even equation solvers . The artificial materials utilized in these studies could be classified into three categories: multilayer films, 1D gratings, and general 2D metasurfaces . Among these structures, the general 2D metasurfaces with strong modulation flexibility are widely employed to realize the desired spatial operation functions mathematically defined by different Green's functions.…”

Section: Introductionmentioning

confidence: 99%

“…Among these structures, the general 2D metasurfaces with strong modulation flexibility are widely employed to realize the desired spatial operation functions mathematically defined by different Green's functions. For practice, simple structures are more preferable, for example by a single layer of resonant metasurface . As an important component for optical processing, the first‐order analog optical spatial differentiator has attracted special attentions .…”

Section: Introductionmentioning

confidence: 99%

“…By introducing metasurfaces, the combined system became thinner and much compact than conventional ones. This progress sheds light on the potential development of optical analog processors based on metasurfaces.There already exist a few potential application examples about metasurface-based analog optical spatial devices such as differentiators, [18][19][20][21][22][23][24][25][26][27][28] integrators, [18,19,25] and even equation solvers. [29][30][31] The artificial materials utilized in these studies could be classified into three categories: multilayer films, [18,21,22] 1D gratings, [23,24,26] and general 2D metasurfaces.…”

mentioning

confidence: 99%

“…[29][30][31] The artificial materials utilized in these studies could be classified into three categories: multilayer films, [18,21,22] 1D gratings, [23,24,26] and general 2D metasurfaces. [19,20,25,[27][28][29][30][31] Among these structures, the general 2D metasurfaces with strong modulation flexibility are widely employed to realize the desired spatial operation functions mathematically defined by different Green's functions. For practice, simple structures are more preferable, for example by a single layer of resonant metasurface.…”

mentioning

confidence: 99%

“…For practice, simple structures are more preferable, for example by a single layer of resonant metasurface. [25,28] As an important component for optical processing, the first-order analog optical spatial differentiator has attracted special attentions. [18][19][20][22][23][24][25][26][27] The practicability has been greatly improved in recent works.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Analog Optical Spatial Differentiators Based on Dielectric Metasurfaces

Zhou

Chen

et al. 2019

Advanced Optical Materials

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Analog spatial differentiator is an important optical computational device that can be potentially used in the field of high‐speed edge detection and optical image processing. In the current stage, a general method is still required to robustly design compact devices for various spectrum or complex situation. In this work, a dielectric metasurface method is proposed and experimentally demonstrated to build optical spatial differentiators. This is physically realized by a high‐quality magnetic resonance mode that is hybridized with the classic bounded surface wave via grating coupling. Experimentally, a well‐defined first‐order differentiation effect is observed at oblique light incidence. The application potential of this device is evaluated by inputting various figures. It is shown that it can perform an optical processor to trace the profiles of the figure content with a resolution better than 30.8 µm. This work may pave a robust way to build ultracompact optical computation devices for real‐time image processors, which can be freely extended to various frequencies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Analog Optical Spatial Differentiators Based on Dielectric Metasurfaces

Zhou

Chen

et al. 2019

Advanced Optical Materials

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Spiral Metalens for Phase Contrast Imaging

Kim

Lee

Sung

et al. 2021

Adv Funct Materials

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Spiral phase contrast imaging offers an excellent opportunity to observe nonlabeled biological samples with slight variations in refractive index or thickness. However, the overall system covering previous works is still complex and bulky, hindering miniaturization and compatibility with conventional systems. Furthermore, high-resolution imaging, particularly for observing biological specimens such as cellular structures, requires several refractive optical elements like objectives and relay optics which dramatically increases the system form factor. Here, it is demonstrated that a metalens, in which the phase profile is a sum of the hyperbolic phase and spiral phase with a topological charge of 1, performs 2D isotropic edge-enhanced imaging. The metalens achieves a submicrometer resolution of up to 0.78 µm operated under visible broadband range in conjunction with a compact form factor. Furthermore, experiments with biological samples can additionally prove the feasibility of practical usage. Capitalizing on compactness and high-resolution characteristics, it is believed that the scheme provides a stepping stone to biomedical imaging technologies and analog computing.

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Laplace Differentiator Based on Metasurface with Toroidal Dipole Resonance

Zhou,

Chen,

et al. 2024

Adv Funct Materials

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As an important method of image processing, image differentiation enables edge detection of targets to achieve recognition of object features and information compression and the computation speed can be boosted by optical information techniques. Traditional optical image differentiation methods mainly rely on spatial spectrum filtering by using classical 4f system, while some work focus on 1D or single‐direction differentiation. It is only in recent years that the rapid development of metasurfaces has facilitated image differentiation methods. In this work, a Laplace operation device is demonstrated based on a silicon hollow brick dielectric resonant metasurface for incident light field. The optical transfer function (OTF) required by the optical Laplace operation can be obtained by exciting an angularly selective toroidal dipole (TD) resonance supported by the metasurface. This hollow silicon brick differentiator not only realizes 2D second‐order edge detection but also has a numerical aperture close to 0.4 and a broad working wavelength range >100 nm and can be directly integrated with imaging systems. Such metadevice may be potentially applied in the fields of optical sensing, microscopy, machine vision, biomedical imaging, etc.

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Two-Dimensional Edge Detection by Guided Mode Resonant Metasurface

Cited by 61 publications

References 15 publications

Analog Optical Spatial Differentiators Based on Dielectric Metasurfaces

Analog Optical Spatial Differentiators Based on Dielectric Metasurfaces

Spiral Metalens for Phase Contrast Imaging

Laplace Differentiator Based on Metasurface with Toroidal Dipole Resonance

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