Graphene-Based Chiral Metasurface for Generation of Tunable Circular Dichroism—Design and Sensor Applications

Roy, Shuvajit; Mondal, Souvik; Debnath, Kapil

doi:10.1109/jsen.2022.3221437

Cited by 15 publications

(2 citation statements)

References 45 publications

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“…By combining chiral metamaterials with plasmonic materials, their chiral optical responses, such as circular dichroism (CD) are able to be tuned and regulated, which take advantage of both the unique plasmon properties and chiral metamaterials. Chiral plasmon metamaterials have found broad applications in various fields such as chiral sensing [2][3][4], optical devices [5,6], analytical chemistry [7][8][9], and so on [10][11][12][13][14]. As one of the crucial parameters of chiral optical response, CD is defined as the difference in the absorption of chiral structures illuminated by left-handed and right-handed circularly polarized lights [15], and it is also reported to be estimated by the spectra difference in the scattering, extinction and/or transmittance spectra [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Chiro-plasmon responses of x-shaped titanium nitride (TiN) nanoarrays by numerical simulations

Zhang,

Du,

Ding

et al. 2024

Phys. Scr.

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Titanium nitride (TiN) has recently been taken as a potential candidate for plasmonic material, which supports surface plasmon resonances and exhibits excellent thermal stability. In this article, we proposed a novel chiral metamaterial with TiN, which consists of X-shaped TiN nanorods periodically arranged on a glass substrate. Its extinction, circular dichroism (CD) spectra, and g-factors were calculated and regulated by the detailed geometry through numerical simulations using the finite element method to further boost the application of TiN in chiro-plasmonic system. We show that it presents chiral responses both in visible and near infrared (NIR) ranges. Under the optimized geometric parameters and NIR incidence, it predicts ~4 and 2 fold E-field enhancement and g-factor, respectively, than that of experimental reports of TiN nanohelices. The obtained excellent chiro properties are elucidated well in terms of the obtained superchiral field and charge distributions, whose origin was analyzed by a linear superposition method. Moreover, the influence of dielectric environments is discussed as well. Overall, the findings underscore the potential of TiN as a chiro-plasmonic refractory metamaterial and shed light on the design of alternative chiro-plasmon metamaterials for NIR applications in the future.

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Section: Introductionmentioning

confidence: 99%

Chiro-plasmon responses of x-shaped titanium nitride (TiN) nanoarrays by numerical simulations

Zhang,

Du,

Ding

et al. 2024

Phys. Scr.

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“…Currently, graphene has exhibited powerful tuning ability for active devices [14,15]. By controlling the chemical potential E f of the graphene, the target operating frequency region can be dynamically shifted [16].…”

Section: Introductionmentioning

confidence: 99%

Excitation of Tunable Dual Quasi-Bound States in the Continuum in Graphene Metasurface and Terahertz Sensing Application

et al. 2023

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This study proposes an all-graphene metasurface supporting dual band symmetric bound state in the continuum (BIC) in the terahertz (THz) range for the rst time. The structure consists of a unit cell containing a double-gap split ring resonator periodically on a dielectric substrate. By introducing symmetry breaking, two plasmonic quasi-BICs (Q-BICs) transmission dips are observed with nite Qfactors and high modulation depth. Simulation and analysis results simultaneously exhibit that the Qfactors of Q-BICs follow an inverse square dependency with the asymmetry degree. Via changing the graphene's chemical potential, the Q-BICs' operating frequency range can be actively expanded. The dual Q-BICs are immune to the variation of incident angle and has a signi cant slow light effect with time delay up to 23.8 ps. In addition, the sensing performance in THz region is investigated. A maximum sensitivity of 267.5 GHz/RIU is obtained with a FOM of 24.08 RIU − 1 . Our work shows an alternative way to design the class of tunable Q-BIC metasurface, which will provide a valuable reference for future dynamic sensor and other elds.

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The Comprehensive Roadmap Toward Malaria Elimination Using Graphene and its Promising 2D Analogs

He,

Junior,

Konar

et al. 2024

Advanced NanoBiomed Research

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Malaria is a major public health concern with over 200 million new cases annually, resulting in significant financial costs. Preventive measures and diagnostic remedies are crucial in saving lives from malaria, and especially in developing nations. 2D materials are, therefore, ideal for fighting such an epidemic. Graphene and its derivatives are extensively studied due to their exceptional properties in this case. The biomedical applications of graphene‐based nanomaterials have gained significant interest in recent years due to their remarkable biocompatibility, solubility, and selectivity. Their unique physicochemical characteristics, like ample surface area, biofunctionality, high purity, solubility, substantial drug‐loading capacity, and superior ability to penetrate cell membranes, make them up‐and‐coming candidates as biodelivery carriers. In this review, crucial graphene‐based technologies to combat malaria are discussed. The advancements in preventing and diagnosing malaria and the biocompatibility of graphene‐based nanomaterials are emphasized. The roadmap for using graphene‐based technology toward achieving the WHO global malaria elimination by 2030 is presented and discussed in detail. Graphene oxide, the most critical biocompatible graphene derivative for health sensors, is also discussed. Additionally, 2D chalcogenides, specifically sulfide‐based transition‐metal dichalcogenides, are reviewed in detecting malaria during its early stages.

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Graphene-Based Chiral Metasurface for Generation of Tunable Circular Dichroism—Design and Sensor Applications

Cited by 15 publications

References 45 publications

Chiro-plasmon responses of x-shaped titanium nitride (TiN) nanoarrays by numerical simulations

Chiro-plasmon responses of x-shaped titanium nitride (TiN) nanoarrays by numerical simulations

Excitation of Tunable Dual Quasi-Bound States in the Continuum in Graphene Metasurface and Terahertz Sensing Application

The Comprehensive Roadmap Toward Malaria Elimination Using Graphene and its Promising 2D Analogs

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