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Opt Lett. 2006 Apr 15;31(8):1112-4.

Voltage-controlled liquid-crystal terahertz phase shifter and quarter-wave plate.

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  • 1Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan 30010.


Phase shift exceeding tau/2 at 1 THz is demonstrated by using electrically controlled birefringence in a homeotropically aligned nematic liquid crystal (E7) cell, 570 microm in thickness. The driving voltage required for a phase shift of 90 degrees is 125 V (rms). We demonstrate that the phase shifter works as an electrically switchable quarter-wave plate at 1 THz. The device can also be used as an electrically tuned phase compensator around the quarter-wave point near 1 THz.

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