Temperature-dependent birefringence of lithium triborate, LBO in the THz regime

Abstract Optical properties of lithium triborate (LBO) in the terahertz regime (0.2–2 THz) were characterized using broadband terahertz time-domain spectroscopy. The frequency dependence of refractive index and absorption coefficient of the LBO crystal was experimentally investigated over the temper...

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Autores principales:	Kechao Song, Zhen Tian, Weili Zhang, Mingwei Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0eccc4b158bd4247bb2e030566cd5c0c
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spelling	oai:doaj.org-article:0eccc4b158bd4247bb2e030566cd5c0c2021-12-02T16:06:53ZTemperature-dependent birefringence of lithium triborate, LBO in the THz regime10.1038/s41598-017-08626-22045-2322https://doaj.org/article/0eccc4b158bd4247bb2e030566cd5c0c2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08626-2https://doaj.org/toc/2045-2322Abstract Optical properties of lithium triborate (LBO) in the terahertz regime (0.2–2 THz) were characterized using broadband terahertz time-domain spectroscopy. The frequency dependence of refractive index and absorption coefficient of the LBO crystal was experimentally investigated over the temperature range of 77–297 K, which the experimental results indicated that LBO has very low optical absorption coefficient at terahertz frequencies especially for the beam polarization along the crystal’s principal dielectric axis X. Moreover, a giant birefringence was observed, and the refractive index difference between the axis X and Z gradually decreased with decreasing temperature, which is attributed to the behavior of the TO phonon modes of B1 and B2 symmetries at low frequencies at different temperatures. As potential applications, LBO can be exemplarily used as terahertz wave shapers, beam splitters, terahertz wave plates, circular polarizers and other polarization devices.Kechao SongZhen TianWeili ZhangMingwei WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kechao Song Zhen Tian Weili Zhang Mingwei Wang Temperature-dependent birefringence of lithium triborate, LBO in the THz regime
description	Abstract Optical properties of lithium triborate (LBO) in the terahertz regime (0.2–2 THz) were characterized using broadband terahertz time-domain spectroscopy. The frequency dependence of refractive index and absorption coefficient of the LBO crystal was experimentally investigated over the temperature range of 77–297 K, which the experimental results indicated that LBO has very low optical absorption coefficient at terahertz frequencies especially for the beam polarization along the crystal’s principal dielectric axis X. Moreover, a giant birefringence was observed, and the refractive index difference between the axis X and Z gradually decreased with decreasing temperature, which is attributed to the behavior of the TO phonon modes of B1 and B2 symmetries at low frequencies at different temperatures. As potential applications, LBO can be exemplarily used as terahertz wave shapers, beam splitters, terahertz wave plates, circular polarizers and other polarization devices.
format	article
author	Kechao Song Zhen Tian Weili Zhang Mingwei Wang
author_facet	Kechao Song Zhen Tian Weili Zhang Mingwei Wang
author_sort	Kechao Song
title	Temperature-dependent birefringence of lithium triborate, LBO in the THz regime
title_short	Temperature-dependent birefringence of lithium triborate, LBO in the THz regime
title_full	Temperature-dependent birefringence of lithium triborate, LBO in the THz regime
title_fullStr	Temperature-dependent birefringence of lithium triborate, LBO in the THz regime
title_full_unstemmed	Temperature-dependent birefringence of lithium triborate, LBO in the THz regime
title_sort	temperature-dependent birefringence of lithium triborate, lbo in the thz regime
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0eccc4b158bd4247bb2e030566cd5c0c
work_keys_str_mv	AT kechaosong temperaturedependentbirefringenceoflithiumtriboratelbointhethzregime AT zhentian temperaturedependentbirefringenceoflithiumtriboratelbointhethzregime AT weilizhang temperaturedependentbirefringenceoflithiumtriboratelbointhethzregime AT mingweiwang temperaturedependentbirefringenceoflithiumtriboratelbointhethzregime
_version_	1718384822686056448

Temperature-dependent birefringence of lithium triborate, LBO in the THz regime

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