期刊
OPTICS LETTERS
卷 45, 期 18, 页码 4988-4991出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.402226
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资金
- National Key Research and Development Program of China [2017YFA0701000]
- National Natural Science Foundation of China [61831012, 61971242]
- Natural Science Foundation of Tianjin City [19JCYBJC16600]
Recently, the terahertz (THz) chiral field control opens a new window to THz devices and their applications. In this Letter, the active manipulation for THz chiral states based on the cholesteric liquid crystal (CLC) has been demonstrated by THz time domain cross-polarization spectroscopy. The results show that the CLC has strong THz optical activity and circular dichroism (CD) effect, and the strongest THz CD of 22 dB and a polarization rotation angle of 88.4 degrees occur around the phase transition temperature TS-N = 250 K. Rising to a room temperature of 300 K, the CLC turns from a chiral state to an isotropic state for THz waves with the phase transition processes of CLC molecules. Therefore, this CLC device can be performed as a thermally active THz circular polarizer, which brings potential applications in THz polarization imaging, broadband communication, and spectroscopy. (C) 2020 Optical Society of America
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