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• W2889698620 abstract "We report the propagation properties of polarized terahertz (THz) waves in a liquid crystal (LC) cell with subwavelength metallic gratings to produce transmissive THz elements with electrical tunability. One-dimensional metallic gratings, which can be used both as transparent electrodes and linear polarizers in the THz regime, were fabricated on the quartz glass substrates of the LC cell. The substrates with and without the metallic grating showed almost identical transmission spectra for a linearly polarized THz wave whose electric field was parallel to the grating vector. We fabricated a 90∘-twisted nematic LC cell using the two substrates with the metallic grating and examined its transmission spectra in the THz regime. During these measurements, we applied a voltage to the LC via the metallic gratings. We calculated in detail the transmission spectra and its voltage dependence based on the effective medium theory for subwavelength structures, the continuum theory of twisted nematic LCs, and the optical constants of the LC in the THz regime. The observed spectra agreed well with theoretical simulations. These results demonstrate that LC cells with subwavelength metallic gratings are useful as active THz elements in applications such as attenuators and polarization rotators." @default.
• W2889698620 created "2018-09-27" @default.
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• W2889698620 date "2019-01-01" @default.
• W2889698620 modified "2023-10-11" @default.
• W2889698620 title "Liquid crystal cells with subwavelength metallic gratings for transmissive terahertz elements with electrical tunability" @default.
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• W2889698620 doi "https://doi.org/10.1016/j.optcom.2018.09.013" @default.
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