Temperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating

Abstract In this work, the terahertz (THz) Smith-Purcell radiations (SPRs) for the relativistic electron bunch passing over an indium antimonide (InSb)-based substrate with a subwavelength grating under various temperatures of substrate are investigated by FDTD simulations and theoretical analyses....

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Autores principales:	Bo Han Cheng, Yu-Siou Ye, Yung-Chiang Lan, Din Ping Tsai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d59a4d881b3d4fbc94917fc2023f6329
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spelling	oai:doaj.org-article:d59a4d881b3d4fbc94917fc2023f63292021-12-02T12:30:16ZTemperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating10.1038/s41598-017-06839-z2045-2322https://doaj.org/article/d59a4d881b3d4fbc94917fc2023f63292017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06839-zhttps://doaj.org/toc/2045-2322Abstract In this work, the terahertz (THz) Smith-Purcell radiations (SPRs) for the relativistic electron bunch passing over an indium antimonide (InSb)-based substrate with a subwavelength grating under various temperatures of substrate are investigated by FDTD simulations and theoretical analyses. The explored SPR is locked and enhanced at a certain emission wavelength with the emission angle still following the wavelength-angle relation of the traditional SPR. This wavelength agrees with the (vacuum) wavelength of surface plasmons (SPs) at the air-InSb interface excited by the electron bunch. The enhancement of SPR at this wavelength is attributed to the energy from electron concentrated in the excited SPs and then transformed into radiation via the SPR mechanism. When the temperature of InSb increases, the emission wavelength of the enhanced SPR decreases along with the emission angles increasing gradually. This work demonstrates that the emission wavelength and angle of the enhanced SPR from the InSb grating can be manipulated by the temperature of InSb. The temperature tunability of SP-enhanced SPR has potential applications in the fields of optical beam steering and metamaterial light source.Bo Han ChengYu-Siou YeYung-Chiang LanDin Ping TsaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bo Han Cheng Yu-Siou Ye Yung-Chiang Lan Din Ping Tsai Temperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating
description	Abstract In this work, the terahertz (THz) Smith-Purcell radiations (SPRs) for the relativistic electron bunch passing over an indium antimonide (InSb)-based substrate with a subwavelength grating under various temperatures of substrate are investigated by FDTD simulations and theoretical analyses. The explored SPR is locked and enhanced at a certain emission wavelength with the emission angle still following the wavelength-angle relation of the traditional SPR. This wavelength agrees with the (vacuum) wavelength of surface plasmons (SPs) at the air-InSb interface excited by the electron bunch. The enhancement of SPR at this wavelength is attributed to the energy from electron concentrated in the excited SPs and then transformed into radiation via the SPR mechanism. When the temperature of InSb increases, the emission wavelength of the enhanced SPR decreases along with the emission angles increasing gradually. This work demonstrates that the emission wavelength and angle of the enhanced SPR from the InSb grating can be manipulated by the temperature of InSb. The temperature tunability of SP-enhanced SPR has potential applications in the fields of optical beam steering and metamaterial light source.
format	article
author	Bo Han Cheng Yu-Siou Ye Yung-Chiang Lan Din Ping Tsai
author_facet	Bo Han Cheng Yu-Siou Ye Yung-Chiang Lan Din Ping Tsai
author_sort	Bo Han Cheng
title	Temperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating
title_short	Temperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating
title_full	Temperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating
title_fullStr	Temperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating
title_full_unstemmed	Temperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating
title_sort	temperature tunability of surface plasmon enhanced smith-purcell terahertz radiation for semiconductor-based grating
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d59a4d881b3d4fbc94917fc2023f6329
work_keys_str_mv	AT bohancheng temperaturetunabilityofsurfaceplasmonenhancedsmithpurcellterahertzradiationforsemiconductorbasedgrating AT yusiouye temperaturetunabilityofsurfaceplasmonenhancedsmithpurcellterahertzradiationforsemiconductorbasedgrating AT yungchianglan temperaturetunabilityofsurfaceplasmonenhancedsmithpurcellterahertzradiationforsemiconductorbasedgrating AT dinpingtsai temperaturetunabilityofsurfaceplasmonenhancedsmithpurcellterahertzradiationforsemiconductorbasedgrating
_version_	1718394427576156160

Temperature tunability of surface plasmon enhanced Smith-Purcell terahertz radiation for semiconductor-based grating

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