Mechanically tunable broadband terahertz modulator based on high-aligned Ni nanowire arrays
Wenfeng Xiang(相文峰)1,†, Xuan Liu(刘旋)1, Xiaowei Huang(黄晓炜)1, Qingli Zhou(周庆莉)2, Haizhong Guo(郭海中)3, and Songqing Zhao(赵嵩卿)4
1 Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing 102249, China; 2 Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Department of Physics, Capital Normal University, Beijing 100037, China; 3 School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, China; 4 School of Arts and Sciences, China University of Peteoleum-Beijing at Karamay, Karamay 834000, China
Abstract We present a mechanically tunable broadband terahertz (THz) modulator based on the high-aligned Ni nanowire (NW) arrays. The modulator is a sandwich structure consisting of two polydimethylsiloxane layers and a central layer of high-aligned Ni NW arrays. Our experimental measurements reveal the transmittance of THz wave can be effectively modulated by mechanical stretching. The NW density in arrays increases with the strain increasing, which induced an enhancement in the absorption of THz wave. When the strain increases from 0 to 6.5%, a linear relationship is observed for the variation of modulation depth (MD) of THz wave regarding the strain, and the modulated range is from 0 to 85% in a frequency range from 0.3 THz to 1.8 THz. Moreover, the detectable MD is about 15% regarding the 1% strain change resolution. This flexible Ni NW-based modulator can be promised many applications, such as remote strain sensing, and wearable devices.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62075245) and Xinjiang Uygur Autonomous Region University Scientific Research Foundation (Grant No. XJEDU2018I021).
Wenfeng Xiang(相文峰), Xuan Liu(刘旋), Xiaowei Huang(黄晓炜), Qingli Zhou(周庆莉), Haizhong Guo(郭海中), and Songqing Zhao(赵嵩卿) Mechanically tunable broadband terahertz modulator based on high-aligned Ni nanowire arrays 2021 Chin. Phys. B 30 026201
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