De Sio Luciano, De Luca Antonio, Liveri Giovanni, Umeton Cesare
CNR-INFM LICRYL, Center of Excellence CEMIF.CAL and Department of Physics, University of Calabria, 87036 Arcavacata di Rende (CS), Italy.
Opt Express. 2010 Jan 4;18(1):31-6. doi: 10.1364/OE.18.000031.
We report on the observation of hysteresis effects that take place in the electro-optical response of a polymer-liquid-crystal-polymer slice grating named POLICRYPS. Investigation of transmittance as a function of an applied external voltage reveals an hysteresis area that is strongly correlated to the delay between consecutive applications of square wave voltages of different amplitude. A suitable software has been implemented to control this delay: when it is long, results show a large hysteresis area, which can be reduced by diminishing the delay. In addition, correlation between this area and the frequency of the applied voltage is analyzed, taking into account that the effect of impurity ions migration is not negligible in the case of low frequencies.
我们报告了在一种名为POLICRYPS的聚合物-液晶-聚合物片状光栅的电光响应中所观察到的滞后效应。对透过率作为外加电压函数的研究揭示了一个滞后区域，该区域与不同幅度方波电压连续施加之间的延迟密切相关。已实施了一个合适的软件来控制此延迟：当延迟较长时，结果显示出较大的滞后区域，可通过减小延迟来降低该区域。此外，考虑到在低频情况下杂质离子迁移的影响不可忽略，分析了该区域与施加电压频率之间的相关性。
