Hsieh Cho-Fan, Pan Ru-Pin, Tang Tsung-Ta, Chen Hung-Lung, Pan Ci-Ling
Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan 30010.
Opt Lett. 2006 Apr 15;31(8):1112-4. doi: 10.1364/ol.31.001112.
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.
通过在厚度为570微米的垂直排列向列相液晶（E7）盒中使用电控双折射，证明了在1太赫兹时相移超过τ/2。实现90度相移所需的驱动电压为125伏（均方根值）。我们证明该移相器在1太赫兹时可作为电可切换四分之一波片工作。该器件还可在1太赫兹附近的四分之一波点附近用作电调谐相位补偿器。
