Optical-induced dielectric tunability properties of DAST crystal in THz range

doi:10.1088/1674-1056/ab4e81

Abstract The optical-induced dielectric tunability properties of DAST crystal in THz range were experimentally demonstrated. The DAST crystal was grown by the spontaneous nucleation method (SNM) and characterized by infrared spectrum. With the optimum wavelength of the exciting optical field, the transmission spectra of the DAST crystal excited by 532 nm laser under different power were measured by terahertz time-domain spectroscopy (THz-TDS) at room temperature. The transmitted THz intensity reduction of 26% was obtained at 0.68 THz when the optical field was up to 80 mW. Meanwhile, the variation of refractive index showed an approximate quadratic behavior with the exciting optical field, which was related to the internal space charge field of photorefractive phenomenon in the DAST crystal caused by the photogenerated carrier. A significant enhancement of 13.7% for THz absorption coefficient occurred at 0.68 THz due to the photogenerated carrier absorption effect in the DAST crystal.

Keywords: THz wave organic DAST crystal photogenerated carrier dielectric property

Received: 23 August 2019
Revised: 27 September 2019
Accepted manuscript online:

PACS:	77.22.-d	(Dielectric properties of solids and liquids)
	66.30.hd	(Ionic crystals)
	61.05.cp	(X-ray diffraction)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2015CB755403) and the National Natural Science Foundation of China (Grant Nos. 61775160, 61771332, 61705162, 51472251, and U1837202).

Corresponding Authors: Yu-Ye Wang
E-mail: yuyewang@tju.edu.cn

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De-Gang Xu(徐德刚), Xian-Li Zhu(朱先立), Yu-Ye Wang(王与烨), Ji-Ning Li(李吉宁), Yi-Xin He(贺奕俽), Zi-Bo Pang(庞子博), Hong-Juan Cheng(程红娟), Jian-Quan Yao(姚建铨) Optical-induced dielectric tunability properties of DAST crystal in THz range 2019 Chin. Phys. B 28 127701

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Optical-induced dielectric tunability properties of DAST crystal in THz range

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