Terahertz frequency characterization of anisotropic structure of tourmaline

doi:10.1007/s12200-017-0749-x

Front. Optoelectron.

2017, Vol. 10

Issue (4) : 409-413 https://doi.org/10.1007/s12200-017-0749-x

RESEARCH ARTICLE

Terahertz frequency characterization of anisotropic structure of tourmaline

Weichong TANG, Zili ZHANG, Ke XIAO, Changchun ZHAO, Zhiyuan ZHENG(

)

School of Science, China University of Geosciences, Beijing 100083, China

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Abstract

The absorption coefficient and refractive index of tourmaline in different directions were characterized for the first time using terahertz time-domain spectroscopy. Results show that the absorption and refractive index of terahertz frequency are related to the structure of tourmaline. Absorption along the optical axis direction is more sensitive than that along the vertical direction. This result indicates that the identification and characterization of crystals as well as minerals can be realized by the terahertz method.

Keywords tourmaline optical properties terahertz spectroscopy

Corresponding Author(s): Zhiyuan ZHENG

Just Accepted Date: 17 November 2017 Online First Date: 12 December 2017 Issue Date: 21 December 2017

Cite this article:

Weichong TANG,Zili ZHANG,Ke XIAO, et al. Terahertz frequency characterization of anisotropic structure of tourmaline[J]. Front. Optoelectron., 2017, 10(4): 409-413.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-017-0749-x
https://academic.hep.com.cn/foe/EN/Y2017/V10/I4/409

Fig.1 Schematic diagram of theTHz-TDS setup based on femtosecond-laser driven photoconductive emitterand electro-optic crystal detector (FS-femtosecond, BS-beam splitter,DL-delay line, PM-parabolic mirror)

Fig.2 Schematic diagram of samplecutting. For sample 1, the cutting direction is perpendicular to the C axis; for sample 2, the cutting is alongthe C axis direction

Fig.3 Experimental schematic diagramof (a) sample 1 and (b) sample 2. The Z axis is the direction of propagation of the THz pulse, and the P axis is the polarization direction of theTHz pulse. When rotating the sample 1, the polarization directionof the THz pulse is always perpendicular to the C axis of tourmaline. For sample 2, the polarization directionof the THz pulse is perpendicular to the C axis of tourmaline. When sample 2 is rotated by 90°, the polarizationdirection of the THz pulse is parallel to the C axis

Fig.4 Frequency dependencies of(a) refractive index and (b) absorption coefficient for sample 1.Replica measurements on four different sample orientations with differentangles of 0°, 30°, 60°, 90°

Fig.5 Frequency dependencies ofthe refractive index and absorption coefficient for sample 2. Replicameasurements of (a) ordinary ray and (b) extraordinary ray

Fig.6 Frequency dependencies ofabsorption coefficient for (a) sample 2 and (b) sample 3, respectively.Replica measurements of the ordinary ray and the extraordinary ray;the polarization direction of the terahertz pulse is along the C axis and perpendicular to the C axis

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