Active control of nanodielectric-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...

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Main Authors: Tan, Thomas CaiWei, Srivastava, Yogesh Kumar, Ako, Rajour Tanyi, Wang, Wenhao, Bhaskaran, Madhu, Sriram, Sharath, Ibraheem Al-Naib, Plum, Eric, Singh, Ranjan
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/151741
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1517412023-02-28T19:54:40Z Active control of nanodielectric-induced THz quasi-BIC in flexible metasurfaces : a platform for modulation and sensing Tan, Thomas CaiWei Srivastava, Yogesh Kumar Ako, Rajour Tanyi Wang, Wenhao Bhaskaran, Madhu Sriram, Sharath Ibraheem Al-Naib Plum, Eric Singh, Ranjan School of Physical and Mathematical Sciences Division of Physics and Applied Physics Centre for Disruptive Photonic Technologies (CDPT) The Photonics Institute Science::Physics::Optics and light Metamaterial Bound State in the Continuum 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. Ministry of Education (MOE) National Research Foundation (NRF) Accepted version The authors acknowledge the funding support from the Singapore Ministry of Education (MOE) (Grant Nos. MOE2016-T3-1-006 and MOE2017-T2-1-110), National Research Foundation Singapore (Grant No. NRF-CRP23-2019-0005), and the UK’s Engineering and Physical Sciences Research Council (Grant Nos. EP/M009122/1 and EP/T02643X/1). 2021-08-12T02:17:27Z 2021-08-12T02:17:27Z 2021 Journal Article Tan, T. C., Srivastava, Y. K., Ako, R. T., Wang, W., Bhaskaran, M., Sriram, S., Ibraheem Al-Naib, Plum, E. & Singh, R. (2021). Active control of nanodielectric-induced THz quasi-BIC in flexible metasurfaces : a platform for modulation and sensing. Advanced Materials, 33(27), 2100836-. https://dx.doi.org/10.1002/adma.202100836 0935-9648 https://hdl.handle.net/10356/151741 10.1002/adma.202100836 27 33 2100836 en MOE2016-T3-1-006 MOE2017-T2-1-110 NRF-CRP23-2019-0005 , Advanced Materials doi:10.21979/N9/LFWXEJ This is the peer reviewed version of the following article: Tan, T. C., Srivastava, Y. K., Ako, R. T., Wang, W., Bhaskaran, M., Sriram, S., Ibraheem Al-Naib, Plum, E. & Singh, R. (2021). Active control of nanodielectric-induced THz quasi-BIC in flexible metasurfaces : a platform for modulation and sensing. Advanced Materials, 33(27), 2100836-, which has been published in final form at https://dx.doi.org/10.1002/adma.202100836. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics::Optics and light
Metamaterial
Bound State in the Continuum
spellingShingle Science::Physics::Optics and light
Metamaterial
Bound State in the Continuum
Tan, Thomas CaiWei
Srivastava, Yogesh Kumar
Ako, Rajour Tanyi
Wang, Wenhao
Bhaskaran, Madhu
Sriram, Sharath
Ibraheem Al-Naib
Plum, Eric
Singh, Ranjan
Active control of nanodielectric-induced THz quasi-BIC in flexible metasurfaces : a platform for modulation and sensing
description 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Tan, Thomas CaiWei
Srivastava, Yogesh Kumar
Ako, Rajour Tanyi
Wang, Wenhao
Bhaskaran, Madhu
Sriram, Sharath
Ibraheem Al-Naib
Plum, Eric
Singh, Ranjan
format Article
author Tan, Thomas CaiWei
Srivastava, Yogesh Kumar
Ako, Rajour Tanyi
Wang, Wenhao
Bhaskaran, Madhu
Sriram, Sharath
Ibraheem Al-Naib
Plum, Eric
Singh, Ranjan
author_sort Tan, Thomas CaiWei
title Active control of nanodielectric-induced THz quasi-BIC in flexible metasurfaces : a platform for modulation and sensing
title_short Active control of nanodielectric-induced THz quasi-BIC in flexible metasurfaces : a platform for modulation and sensing
title_full Active control of nanodielectric-induced THz quasi-BIC in flexible metasurfaces : a platform for modulation and sensing
title_fullStr Active control of nanodielectric-induced THz quasi-BIC in flexible metasurfaces : a platform for modulation and sensing
title_full_unstemmed Active control of nanodielectric-induced THz quasi-BIC in flexible metasurfaces : a platform for modulation and sensing
title_sort active control of nanodielectric-induced thz quasi-bic in flexible metasurfaces : a platform for modulation and sensing
publishDate 2021
url https://hdl.handle.net/10356/151741
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