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在制备液晶光开关的基础上,采用聚合物分散液晶(PDLC)与金属反射光栅压合的方法研制了一种新型反射式液晶光栅器件,并对其响应时间、调制电压、不同偏振态和不同入射角情况下的衍射效率等光电参数进行了测试。结果表明,该液晶反射光栅具有电场可调性,当驱动电压小于特定值时仅观察到常规反射现象,当驱动电压大于40V时器件出现明显的光栅衍射效应,且1级衍射效率最大可到6.7%。实验讨论了入射光的偏振态、入射角度等因素对PDLC光栅衍射效率的影响,同时测试了该液晶反射光栅的电场响应时间为10ms。
Based on the preparation of liquid crystal optical switches, a new type of reflective liquid crystal grating device is fabricated by using polymer dispersed liquid crystal (PDLC) and metal reflection grating lamination, and its response time, modulation voltage, different polarization states and different The diffraction efficiency and other optical parameters under the incident angle were tested. The results show that the liquid crystal reflective grating has adjustable electric field. When the driving voltage is less than a certain value, only conventional reflection phenomenon is observed. When the driving voltage is greater than 40V, the device exhibits obvious grating diffraction effect, and the first order diffraction efficiency can reach 6.7 %. The influence of incident light polarization state, incident angle and other factors on the diffraction efficiency of PDLC grating was discussed experimentally, and the electric field response time of the liquid crystal reflective grating was tested to be 10ms.