Characterization of the THz absorption spectra of nematic liquid crystals via THz time-domain spectroscopy using mode-locked Yb-doped fiber laser

被引：2
|
作者：
Choi, Hansol [1 ]
Kim, Jisu [1 ]
Ahn, Soyeon [1 ]
Han, Sang Pil [2 ]
Chen, Zhongping [3 ]
Jeon, Min Yong [1 ,4 ]
机构：
[1] Chungnam Natl Univ, Dept Phys, 99 Daehak Ro, Daejeon 34134, South Korea
[2] Elect & Telecommun Res Inst, Photon Wireless Devices Res Div, Daejeon 34129, South Korea
[3] UC Irvine, Beckman Laser Inst, Irvine, CA 92612 USA
[4] Chungnam Natl Univ, Inst Quantum Syst IQS, 99 Daehak Ro, Daejeon 34134, South Korea
来源：
OPTICAL FIBER TECHNOLOGY | 2021年 / 66卷
基金：
新加坡国家研究基金会;
关键词：
Yb-doped fiber laser; Mode-locked fiber laser; Time-domain THz spectroscopy; Nematic liquid crystals; TERAHERTZ; GENERATION; SYSTEM; NOISE;
D O I：
10.1016/j.yofte.2021.102685
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this paper, the terahertz (THz) absorption spectra of a nematic liquid crystal (NLC) cell are estimated via THz time-domain spectroscopy (TDS) using a mode-locked Yb-doped fiber laser as the pump source. The THz-TDS system is implemented by using a dipole antenna as an emitter and a bow tie antenna as a receiver. A THz emission bandwidth exceeding 2.2 THz is achieved corresponding to a free spacing of 220 mm and a signal-tonoise ratio exceeding 30 dB. Subsequently, this system was utilized to measure and analyze the THz absorption spectrum of an E7 NLC cell by applying an electric field. The conclusions experimentally confirmed that the absorption of the specific THz frequency of the cell is inversely proportional to the intensity of the electric field applied to the NLC cell.
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收藏
页数：6
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