초록
전기적으로 굴절율 변조값을 조절할 수 있는 부피형 홀로그램 매질(HPDLC)을 제작하였다. HPDLC는 4가 acrylate monomer를 기초로 한 전폴리머(prepolymer)와 액정 혼합물 E7 등으로 구성되어져 있다. 제작된 매질의 광학적 특성을 조사하기 위해 액정 농도, 전기장의 세기에 따른 회전효율을 측정하고, 홀로그래피 방법으로 상을 기록한 후 재생된 상을 전기적으로 조절할 수 있음을 보였다.
We report on the results of holographic transmission grating that can be controlled by the applied AC electric field. We have fabricated a polymer-dispersed liquid crystal material that composed of multifunctional acrylate monomer blended with the liquid crystal mixture E7. To investigate an electro-optic properties of fabricated HPDLC, diffraction efficienties (DE) are measured as a fuction of applied electric field and density of liquid crystal. Maximum DE of about 70% is obtained about 30 wt% of LC concentration at a zero field. We have also shown that optical image was recorded in the tllm, and then the reconstructive image was switchable with the applied electric fields. ields.