9 February 2007 Liquid-crystal-based electrically tunable THz optical devices
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In this work, we report recent progress in liquid-crystal-based electrically tunable THz optical devices. Tunable phase shift up to 360° at 1 THz is demonstrated using electrically controlled birefringence in a vertically aligned nematic liquid crystal (E7) cell, 1.83 mm in thickness. The driving voltage and corresponding field required for a phase shift of 360° at 1 THz are 100 V and 90.5 V/cm, respectively. A sandwiched NLC cell about 2 mm in total thickness is used to increase the interaction length while minimizing Fresnel losses at the interfaces. A phase shift of 367° is demonstrated at 1.05 THz, significantly improving the dynamic response of the device.
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Ci-Ling Pan, Ci-Ling Pan, Ru-Pin Pan, Ru-Pin Pan, } "Liquid-crystal-based electrically tunable THz optical devices", Proc. SPIE 6487, Emerging Liquid Crystal Technologies II, 648709 (9 February 2007); doi: 10.1117/12.717074; https://doi.org/10.1117/12.717074

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