Ultra-narrowband and highly-directional THz thermal emitters based on the bound state in the continuum

The development of novel and cost-effective THz emitters, with properties superior to current THz sources, is an active and important field of research. In this work, we propose and numerically demonstrate a simple yet effective approach of realizing terahertz sources working in continuous-wave form...

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Autores principales:	Sun Kaili, Zhao Zongshan, Cai Yangjian, Levy Uriel, Han Zhanghua
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	bound state in the continuum terahertz thermal emitter Physics QC1-999
Acceso en línea:	https://doaj.org/article/0dfa7479e664466990e790c611f67651
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spelling	oai:doaj.org-article:0dfa7479e664466990e790c611f676512021-12-05T14:10:56ZUltra-narrowband and highly-directional THz thermal emitters based on the bound state in the continuum2192-861410.1515/nanoph-2021-0380https://doaj.org/article/0dfa7479e664466990e790c611f676512021-10-01T00:00:00Zhttps://doi.org/10.1515/nanoph-2021-0380https://doaj.org/toc/2192-8614The development of novel and cost-effective THz emitters, with properties superior to current THz sources, is an active and important field of research. In this work, we propose and numerically demonstrate a simple yet effective approach of realizing terahertz sources working in continuous-wave form, by incorporating the new physics of bound state in the continuum (BIC) into thermal emitters. By deliberately designing the structure of slotted disk array made of high-resistivity silicon on top of a low index dielectric buffer layer supported by a conducting substrate, a quasi-BIC mode with ultra-high quality factor (∼104) can be supported. Our results reveal that the structure can operate as an efficient terahertz thermal emitter with near-unity emissivity and ultranarrow bandwidth. For example, an emitter working at 1.3914 THz with an ultranarrow linewidth less than 130 MHz, which is roughly 4 orders of magnitude smaller than that obtained from a metallic metamaterial-based thermal emitter, is shown. In addition to its high monochromaticity, this novel emitter has additional important advantages including high directionality and linear polarization, which makes it a promising candidate as the new generation of THz sources. It holds a great potential for practical applications where high spectral resolving capability is required.Sun KailiZhao ZongshanCai YangjianLevy UrielHan ZhanghuaDe Gruyterarticlebound state in the continuumterahertzthermal emitterPhysicsQC1-999ENNanophotonics, Vol 10, Iss 16, Pp 4035-4043 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bound state in the continuum terahertz thermal emitter Physics QC1-999
spellingShingle	bound state in the continuum terahertz thermal emitter Physics QC1-999 Sun Kaili Zhao Zongshan Cai Yangjian Levy Uriel Han Zhanghua Ultra-narrowband and highly-directional THz thermal emitters based on the bound state in the continuum
description	The development of novel and cost-effective THz emitters, with properties superior to current THz sources, is an active and important field of research. In this work, we propose and numerically demonstrate a simple yet effective approach of realizing terahertz sources working in continuous-wave form, by incorporating the new physics of bound state in the continuum (BIC) into thermal emitters. By deliberately designing the structure of slotted disk array made of high-resistivity silicon on top of a low index dielectric buffer layer supported by a conducting substrate, a quasi-BIC mode with ultra-high quality factor (∼104) can be supported. Our results reveal that the structure can operate as an efficient terahertz thermal emitter with near-unity emissivity and ultranarrow bandwidth. For example, an emitter working at 1.3914 THz with an ultranarrow linewidth less than 130 MHz, which is roughly 4 orders of magnitude smaller than that obtained from a metallic metamaterial-based thermal emitter, is shown. In addition to its high monochromaticity, this novel emitter has additional important advantages including high directionality and linear polarization, which makes it a promising candidate as the new generation of THz sources. It holds a great potential for practical applications where high spectral resolving capability is required.
format	article
author	Sun Kaili Zhao Zongshan Cai Yangjian Levy Uriel Han Zhanghua
author_facet	Sun Kaili Zhao Zongshan Cai Yangjian Levy Uriel Han Zhanghua
author_sort	Sun Kaili
title	Ultra-narrowband and highly-directional THz thermal emitters based on the bound state in the continuum
title_short	Ultra-narrowband and highly-directional THz thermal emitters based on the bound state in the continuum
title_full	Ultra-narrowband and highly-directional THz thermal emitters based on the bound state in the continuum
title_fullStr	Ultra-narrowband and highly-directional THz thermal emitters based on the bound state in the continuum
title_full_unstemmed	Ultra-narrowband and highly-directional THz thermal emitters based on the bound state in the continuum
title_sort	ultra-narrowband and highly-directional thz thermal emitters based on the bound state in the continuum
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/0dfa7479e664466990e790c611f67651
work_keys_str_mv	AT sunkaili ultranarrowbandandhighlydirectionalthzthermalemittersbasedontheboundstateinthecontinuum AT zhaozongshan ultranarrowbandandhighlydirectionalthzthermalemittersbasedontheboundstateinthecontinuum AT caiyangjian ultranarrowbandandhighlydirectionalthzthermalemittersbasedontheboundstateinthecontinuum AT levyuriel ultranarrowbandandhighlydirectionalthzthermalemittersbasedontheboundstateinthecontinuum AT hanzhanghua ultranarrowbandandhighlydirectionalthzthermalemittersbasedontheboundstateinthecontinuum
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Ultra-narrowband and highly-directional THz thermal emitters based on the bound state in the continuum

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