Symmetry-protected dual bound states in the continuum in metamaterials
Bound state in the continuum (BIC) is a mathematical concept with an infinite radiative quality factor (Q) that exists only in an ideal infinite array of resonators. In photonics, it is essential to achieve high Q resonances for enhanced light-mater interactions that could enable low-threshold laser...
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sg-ntu-dr.10356-1402122023-02-28T19:55:53Z Symmetry-protected dual bound states in the continuum in metamaterials Cong, Longqing Singh, Ranjan School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies The Photonics Institute Science::Physics::Optics and light Bound State In The Continuum Fano Resonance Bound state in the continuum (BIC) is a mathematical concept with an infinite radiative quality factor (Q) that exists only in an ideal infinite array of resonators. In photonics, it is essential to achieve high Q resonances for enhanced light-mater interactions that could enable low-threshold lasers, ultrasensitive sensors, and optical tweezers. Hence, it is important to explore BICs in different photonic systems including subwavelength metamaterials where symmetry-protected dual BICs exist. The spectral features of dual BICs are experimentally verified in the terahertz domain by breaking the C2 symmetry that invokes a leakage channel in the form of weakly radiating Fano resonance and electromagnetically induced transparency. The radiative Q factors tend to infinity at discrete symmetry-restoring points and obey an inverse square dependence on the structural asymmetry. BICs in metamaterials allow extreme field confinement with small mode volumes, thereby improving the rate of spontaneous emission in the cavity with much larger Purcell factor. In addition, the topological nature enables a robust existence of BICs with a vector beam profile that is ideal for lasing. The symmetry-protected BICs in metamaterials also possess a unique advantage of scalability at different wavelengths for potential applications in sensing, lasing, switching, and spectral filtering. 2020-05-27T06:36:58Z 2020-05-27T06:36:58Z 2019 Journal Article Cong, L., & Singh, R. (2019). Symmetry-protected dual bound states in the continuum in metamaterials. Advanced Optical Materials, 7(13), 1900383-. doi:10.1002/adom.201900383 2195-1071 https://hdl.handle.net/10356/140212 10.1002/adom.201900383 2-s2.0-85065320695 13 7 en MOE2017‐T2‐1‐110 MOE2016‐T3‐1‐006 NRF2016‐NRF‐ANR004 Advanced Optical Materials 10.21979/N9/ZUUGII © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved. This paper was published in Advanced Optical Materials and is made available with permission of WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. application/pdf |
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Science::Physics::Optics and light Bound State In The Continuum Fano Resonance Cong, Longqing Singh, Ranjan Symmetry-protected dual bound states in the continuum in metamaterials |
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Bound state in the continuum (BIC) is a mathematical concept with an infinite radiative quality factor (Q) that exists only in an ideal infinite array of resonators. In photonics, it is essential to achieve high Q resonances for enhanced light-mater interactions that could enable low-threshold lasers, ultrasensitive sensors, and optical tweezers. Hence, it is important to explore BICs in different photonic systems including subwavelength metamaterials where symmetry-protected dual BICs exist. The spectral features of dual BICs are experimentally verified in the terahertz domain by breaking the C2 symmetry that invokes a leakage channel in the form of weakly radiating Fano resonance and electromagnetically induced transparency. The radiative Q factors tend to infinity at discrete symmetry-restoring points and obey an inverse square dependence on the structural asymmetry. BICs in metamaterials allow extreme field confinement with small mode volumes, thereby improving the rate of spontaneous emission in the cavity with much larger Purcell factor. In addition, the topological nature enables a robust existence of BICs with a vector beam profile that is ideal for lasing. The symmetry-protected BICs in metamaterials also possess a unique advantage of scalability at different wavelengths for potential applications in sensing, lasing, switching, and spectral filtering. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Cong, Longqing Singh, Ranjan |
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Article |
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Cong, Longqing Singh, Ranjan |
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Cong, Longqing |
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Symmetry-protected dual bound states in the continuum in metamaterials |
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Symmetry-protected dual bound states in the continuum in metamaterials |
title_full |
Symmetry-protected dual bound states in the continuum in metamaterials |
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Symmetry-protected dual bound states in the continuum in metamaterials |
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Symmetry-protected dual bound states in the continuum in metamaterials |
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symmetry-protected dual bound states in the continuum in metamaterials |
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2020 |
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https://hdl.handle.net/10356/140212 |
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