Fuh A Y, Liao C C, Hsu K C, Lu C L, Tsai C Y
Opt Lett. 2001 Nov 15;26(22):1767-9. doi: 10.1364/ol.26.001767.
The dynamic behavior of a holographic grating induced in a homeotropically aligned dye-doped liquid-crystal film is investigated. In the presence of an applied dc voltage, photoexcited azo dyes induce a photorefractive grating and then diffuse and are adsorbed onto cell substrates. The reorientation of liquid crystals as a result of adsorbed dyes leads to a phase grating that is phase shifted 90 degrees from the photorefractive grating. Competition of these two gratings induces two-beam coupling of the writing beams, initially transferring energy from beam 1 to beam 2 and then, after a pause, from beam 2 to beam 1.
研究了在垂直排列的染料掺杂液晶膜中诱导产生的全息光栅的动态行为。在施加直流电压的情况下，光激发的偶氮染料会诱导产生一个光折变光栅，然后扩散并吸附到液晶盒基板上。由于吸附染料导致的液晶重新取向会产生一个相位光栅，该相位光栅相对于光折变光栅有90度的相移。这两个光栅的竞争会引发写入光束的两波耦合，最初能量从光束1转移到光束2，然后在暂停一段时间后，又从光束2转移到光束1。
