Browsing by Author "Tang, TT"

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Voltage-controlled liquid-crystal terahertz phase shifter and quarter-wave plate
(2006-04-15)
Hsieh, CF
;
Pan, RP
;
Tang, TT
;
Chen, HL
;
Pan, CL
Phase shift exceeding pi/2 at 1 THz is demonstrated by using electrically controlled birefringence in a homeotropically aligned nematic liquid crystal (E7) cell, 570 mu m 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 I THz. The device can also be used as an electrically tuned phase compensator around the quarter-wave point near 1 THz. (c) 2006 Optical Society of America.