Wu Yung-Hsun, Liang Xiao, Lu Yan-Qing, Du Fang, Lin Yi-Hsin, Wu Shin-Tson
College of Optics and Photonics, University of Central Florida, 4000 Central Florida Boulevard, Orlando, Florida 32816, USA.
Appl Opt. 2005 Jul 10;44(20):4394-7. doi: 10.1364/ao.44.004394.
A transmission-type variable optical attenuator (VOA) based on a polymer-stabilized dual-frequency liquid crystal (PSDFLC) is demonstrated at gamma = 1.55 microm. The VOA is highly transparent in the voltage-off state but scatters light in the voltage-on state. By using a birefringent beam displacer incorporated with half-wave plates, we can obtain a VOA that is polarization independent and that exhibits a 31 dB dynamic range. The polymer networks and dual-frequency effect together reduce the response time (rise + decay) of a 16 microm PSDFLC cell to 30 ms at room temperature and at a voltage of 24 Vrms.
在γ = 1.55微米波长下展示了一种基于聚合物稳定双频液晶（PSDFLC）的透射型可变光衰减器（VOA）。该VOA在关断电压状态下具有高透明度，而在开启电压状态下会散射光。通过使用结合了半波片的双折射光束位移器，我们可以获得一种偏振无关且动态范围为31 dB的VOA。聚合物网络和双频效应共同将一个16微米PSDFLC盒在室温及24 Vrms电压下的响应时间（上升+下降）缩短至30毫秒。
