Ultrathin Capacitive Metasurfaces for Strong Electric Response

Kim, Kyoung‐Ho; Jung, Gwang‐Hun; Lee, Seojoo; Park, Hong-Gyu; Park, Q‐Han

doi:10.1002/adom.201600146

Cited by 4 publications

(2 citation statements)

References 40 publications

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Section: Introductionmentioning

confidence: 99%

Advancements and Perspectives in Optical Biosensors

Mostufa,

Rezaei,

Ciannella

et al. 2024

ACS Omega

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Optical biosensors exhibit immense potential, offering extraordinary possibilities for biosensing due to their high sensitivity, reusability, and ultrafast sensing capabilities. This review provides a concise overview of optical biosensors, encompassing various platforms, operational mechanisms, and underlying physics, and it summarizes recent advancements in the field. Special attention is given to plasmonic biosensors and metasurface-based biosensors, emphasizing their significant performance in bioassays and, thus, their increasing attraction in biosensing research, positioning them as excellent candidates for lab-on-chip and point-of-care devices. For plasmonic biosensors, we emphasize surface plasmon resonance (SPR) and its subcategories, along with localized surface plasmon resonance (LSPR) devices and surface enhance Raman spectroscopy (SERS), highlighting their ability to perform diverse bioassays. Additionally, we discuss recently emerged metasurface-based biosensors. Toward the conclusion of this review, we address current challenges, opportunities, and prospects in optical biosensing. Considering the advancements and advantages presented by optical biosensors, it is foreseeable that they will become a robust and widespread platform for early disease diagnostics.

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Section: Introductionmentioning

confidence: 99%

Advancements and Perspectives in Optical Biosensors

Mostufa,

Rezaei,

Ciannella

et al. 2024

ACS Omega

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“…To simplify the problem, we assume that the rectangular rings are made of a perfect electric conductor (PEC) with side lengths a, b (a < b) smaller than the wavelength λ of the incident light. For tightly coupled resonators with narrow gaps gx, gy << λ, nearby resonators can interact with each other through charges induced by incident light [16]. These capacitive interactions open a highly efficient transmission channel through the gap (channel c (2) ) mediated by the funneling process [17,18].…”

Section: Introductionmentioning

confidence: 99%

Gap-Size-Dependent Effective Phase Transition in Metasurfaces of Closed-Ring Resonators

Lee

Kang

2021

Crystals

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We theoretically investigate a metal-to-insulator transition in artificial two-dimensional (2D) crystals (i.e., metasurfaces) of tightly coupled closed-ring resonators. Strong interaction between unit resonators in the metasurfaces yields the effective permittivity highly dependent on the lattice spacing of unit resonators. Through our rigorous theory, we provide a closed form of effective permittivity of the metasurface and reveal that the permittivity possesses a Lorentzian-type resonant behavior, implying that the transition of the effective permittivity can arise when the lattice spacing passes a critical value.

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Directional Janus Metasurface

et al. 2019

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Janus monolayers, a class of two‐faced 2D materials, have received significant attention in electronics, due to their unusual conduction properties stemming from their inherent out‐of‐plane asymmetry. Their photonic counterparts recently allowed for the control of hydrogenation/dehydrogenation processes, yielding drastically different responses for opposite light excitation spins. A passive Janus metasurface composed of cascaded subwavelength anisotropic impedance sheets is demonstrated. By introducing a rotational twist in their geometry, asymmetric transmission with the desired phase function is realized. Their broken out‐of‐plane symmetry realizes different functions for opposite propagation directions, enabling direction‐dependent versatile functionalities. A series of passive Janus metasurfaces that enable functionalities including one‐way anomalous refraction, one‐way focusing, asymmetric focusing, and direction‐controlled holograms are experimentally demonstrated.

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Ultrathin Capacitive Metasurfaces for Strong Electric Response

Cited by 4 publications

References 40 publications

Advancements and Perspectives in Optical Biosensors

Advancements and Perspectives in Optical Biosensors

Gap-Size-Dependent Effective Phase Transition in Metasurfaces of Closed-Ring Resonators

Directional Janus Metasurface

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