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Active Control of Nano-dielectric-induced THz Quasi-BIC in Flexible Metasurfaces: A Platform for Modulation and Sensing

Active Control of Nano-dielectric-induced THz Quasi-BIC in Flexible Metasurfaces: A Platform for Modulation and Sensing
Active Control of Nano-dielectric-induced THz Quasi-BIC in Flexible Metasurfaces: A Platform for Modulation and Sensing

A bound state in the continuum (BIC) is a nonradiating state of light embedded in the continuum of propagating modes providing drastic enhancement of the electromagnetic field and its localization at micro–nanoscale. However, access to such modes in the far-field requires symmetry breaking. Here, it is demonstrated that a nanometric dielectric or semiconductor layer, 1000 times thinner than the resonant wavelength (λ/1000), induces a dynamically controllable quasi-bound state in the continuum (QBIC) with ultrahigh quality factor in a symmetric metallic metasurface at terahertz frequencies. Photoexcitation of nanostrips of germanium activates ultrafast switching of a QBIC resonance with 200% transmission intensity modulation and complete recovery within 7 ps on a low-loss flexible substrate. The nanostrips also form microchannels that provide an opportunity for BIC-based refractive index sensing. An optimization model is presented for (switchable) QBIC resonances of metamaterial arrays of planar symmetric resonators modified with any (active) dielectric for inverse metamaterial design that can serve as an enabling platform for active micro–nanophotonic devices.

bound states in the continuum, flexible metasurfaces, nanophotonic devices, switchable active metasurfaces, terahertz metamaterial sensors
1521-4095
Tan, Thomas CaiWei
9bffc8f9-a3f6-4195-9e0d-126a1f1f0f2b
Srivastava, Yogesh Kumar
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Ako, Rajour Tanyi
8ed9af6f-bda0-42a9-871a-1d88f8554deb
Wang, Wenhao
9c74d7e7-e58b-4d2a-a50d-8dea8a3b6522
Bhaskaran, Madhu
0eebf418-65ce-4cc9-a8d5-31d61d4e19ec
Sriram, Sharath
fcb68448-9fb4-44dc-a8ec-1114346f76f4
Al-Naib, Ibraheem
4c9e6cef-e7ad-4618-8ad0-62f62dc085be
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5
Singh, Ranjan
895cd3c3-d3d4-4c1f-81f9-f7cbbd13eae8
Tan, Thomas CaiWei
9bffc8f9-a3f6-4195-9e0d-126a1f1f0f2b
Srivastava, Yogesh Kumar
968cc6c3-957e-4712-82fb-846339345036
Ako, Rajour Tanyi
8ed9af6f-bda0-42a9-871a-1d88f8554deb
Wang, Wenhao
9c74d7e7-e58b-4d2a-a50d-8dea8a3b6522
Bhaskaran, Madhu
0eebf418-65ce-4cc9-a8d5-31d61d4e19ec
Sriram, Sharath
fcb68448-9fb4-44dc-a8ec-1114346f76f4
Al-Naib, Ibraheem
4c9e6cef-e7ad-4618-8ad0-62f62dc085be
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5
Singh, Ranjan
895cd3c3-d3d4-4c1f-81f9-f7cbbd13eae8

Tan, Thomas CaiWei, Srivastava, Yogesh Kumar, Ako, Rajour Tanyi, Wang, Wenhao, Bhaskaran, Madhu, Sriram, Sharath, Al-Naib, Ibraheem, Plum, Eric and Singh, Ranjan (2021) Active Control of Nano-dielectric-induced THz Quasi-BIC in Flexible Metasurfaces: A Platform for Modulation and Sensing. Advanced Materials, 33 (27), [2100836]. (doi:10.1002/adma.202100836).

Record type: Article

Abstract

A bound state in the continuum (BIC) is a nonradiating state of light embedded in the continuum of propagating modes providing drastic enhancement of the electromagnetic field and its localization at micro–nanoscale. However, access to such modes in the far-field requires symmetry breaking. Here, it is demonstrated that a nanometric dielectric or semiconductor layer, 1000 times thinner than the resonant wavelength (λ/1000), induces a dynamically controllable quasi-bound state in the continuum (QBIC) with ultrahigh quality factor in a symmetric metallic metasurface at terahertz frequencies. Photoexcitation of nanostrips of germanium activates ultrafast switching of a QBIC resonance with 200% transmission intensity modulation and complete recovery within 7 ps on a low-loss flexible substrate. The nanostrips also form microchannels that provide an opportunity for BIC-based refractive index sensing. An optimization model is presented for (switchable) QBIC resonances of metamaterial arrays of planar symmetric resonators modified with any (active) dielectric for inverse metamaterial design that can serve as an enabling platform for active micro–nanophotonic devices.

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Active Control of Nano-dielectric-induced THz Quasi-BIC in Flexible Metasurfaces: A Platform for Modulation and Sensing - Accepted Manuscript
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Accepted/In Press date: 6 April 2021
e-pub ahead of print date: 28 May 2021
Published date: 8 July 2021
Keywords: bound states in the continuum, flexible metasurfaces, nanophotonic devices, switchable active metasurfaces, terahertz metamaterial sensors

Identifiers

Local EPrints ID: 448652
URI: http://eprints.soton.ac.uk/id/eprint/448652
ISSN: 1521-4095
PURE UUID: d0033bb6-8555-4f69-a5f9-62aa85e5db43
ORCID for Eric Plum: ORCID iD orcid.org/0000-0002-1552-1840

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Date deposited: 29 Apr 2021 16:30
Last modified: 17 Mar 2024 03:16

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Contributors

Author: Thomas CaiWei Tan
Author: Yogesh Kumar Srivastava
Author: Rajour Tanyi Ako
Author: Wenhao Wang
Author: Madhu Bhaskaran
Author: Sharath Sriram
Author: Ibraheem Al-Naib
Author: Eric Plum ORCID iD
Author: Ranjan Singh

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