Ultrahigh-Q Resonance in Bound States in the Continuum–Enabled Plasmonic Terahertz Metasurface
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(Published version)
Date
2023
Authors
Islam, M.S.
Upadhyay, A.
Ako, R.T.
Lawrence, N.P.
Sultana, J.
Ranjan, A.
Ng, B.W.-H.
Tansu, N.
Bhaskaran, M.
Sriram, S.
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Journal article
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Advanced Photonics Research, 2023; 4(9):2300121-1-2300121-8
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Md Saiful Islam, Aditi Upadhyay, Rajour Tanyi Ako, Nicholas P. Lawrence, Jakeya Sultana, Abhishek Ranjan, Brian Wai-Him Ng, Nelson Tansu, Madhu Bhaskaran, Sharath Sriram, and Derek Abbott
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Abstract
The study of optical resonators is of significant importance in terms of their ability to confine light in optical devices. A major drawback of optical resonators is the phenomenon of light emission due to their limited capacity for light confinement. Bound states in the continuum are gaining significant attention in the realization of optical devices due to their unique ability for reducing light scattering via interference mechanisms. This process can potentially suppress scattering, leading to improved optical performance. Using this concept, a metasurface having two elliptical silicon (Si) resonators nonidentically angled to create an outof-plane asymmetry is studied. Various parameters are optimized by employing a genetic algorithm (GA) to subsequently achieve a high-Q factor at terahertz frequencies. Herein, the device is fabricated using a novel method, and a thick high-index resonator is achieved. Terahertz measurements are carried out to validate the results. It is indicated in the experimental results that plasmons appear at the top surface of the metasurface and create strong sharp resonances that are sensitive to the external environment. Owing to strong field confinement ability, and high-Q factor, the metasurface is sensitive to its surrounding environment and can be essentially employed in terahertz sensing applications.
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© 2023 The Authors. Advanced Photonics Research published by WileyVCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.