Journal
APPLIED OPTICS
Volume 61, Issue 28, Pages 8265-8272Publisher
Optica Publishing Group
DOI: 10.1364/AO.469263
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Funding
- Natural Science Foundation of Anhui Province
- National Natural Science Foundation of China
- Fundamental Research Funds for the Central Universities
- [2208085MF160]
- [62001150]
- [JZ2022HGTB0270]
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This work demonstrates a tunable cross-polarized transmission structure at the terahertz frequency and investigates the polarization state during modulation. By improving the resonance process in a Fabry-Perot-like resonant cavity, the proposed structure significantly enhances the polarization conversion performance.
In this work, a tunable cross-polarized transmission structure at the terahertz frequency was demonstrated, and the polarization state during modulation was investigated. The proposed structure can significantly enhance the polarization conversion performance of nematic liquid crystals by leveraging the formation of a Fabry-Perot-like resonant cavity that consists of two metal gratings. As a result, the incident waves are continuously reflected in the liquid crystal layer to complete the accumulation of polarization angle changes. From the experimental results acquired, it was concluded that the insertion loss of the cross-polarization transmission was less than 3 dB and the extinction ratio was larger than 28 dB in the frequency range of 388-426 GHz. Our work provides useful insights for improving the efficiency of cross-polarization conversion by enhancing the resonance process in a Fabry- Perot-like resonant cavity and, thus, significantly extending the equivalent optical path. (c) 2022 Optica Publishing Group
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