期刊
PHYSICAL REVIEW APPLIED
卷 3, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.3.064007
关键词
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资金
- Serbian Ministry of Education, Science and Technological Development [OI171005]
- Italian Ministry of Foreign Affairs, Directorate General for the Country Promotion (LC-NANOPLASM)
Liquid-crystal devices are a promising cheap alternative for terahertz light modulation, albeit they suffer from problems associated with thick cells. Here we describe a few-micron-thick polarization-independent nematic liquid-crystal metamaterial device displaying terahertz reflectance modulation depths above 23 dB, millisecond response times, low operating voltages, and a spectral tuning of more than 15%. The dramatic performance improvement is based on invoking critical coupling with external fields, which rests on a suitable choice of resonator geometry. We analyze the coupling mechanism to conclude that perfect absorption can be reached with a wide range of parameters and liquid-crystal materials. The proposed device performance, microscopic details, and the nematic molecule switching dynamics are evaluated with the use of a rigorous tensorial formulation of the Landau-de Gennes theory and shown to be robust to small parameter deviations.
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