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Terahertz electrically controlled nematic liquid crystal lens |
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| Authors: | Hui Li Chen Zhu Kan Liu Xinyu Zhang Furi Ling Tianxu Zhang Xubang Shen Cunlin Zhang Shuangchen Ruan |
| Institution: | aInstitute for Pattern Recognition and Artificial Intelligence, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;bNational Key Laboratory of Science and Technology on Multi-spectral Information Processing, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;cWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;dDepartment of Physics, Capital Normal University, Beijing 10048, China;eCollege of Electronic Science and Technology, Shenzhen University, Shenzhen, Guangdong 518060, China |
| Abstract: | We report some preliminary results on the realization of terahertz (THz) nematic liquid crystal (LC) lens with electric tunable focal length. A LC cell with a single circular-hole electrode is driven by an AC voltage to yield the desired spatial distribution of the refractive index. The two-dimensional function of the phase delay introduced into THz wave depends on the AC voltage and the electrodes contacting the LC layer. This lens is operated at room temperature and its convergent optical characteristic is demonstrated at 118 μm. We realize the lens with a clear aperture of 1 mm. The lens matched with a bolometer array is capable of obtaining real-time THz images of a sample without any mechanical scanning. |
| Keywords: | Terahertz Liquid crystal Tunable focal length Real-time THz imaging |
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