液晶全像材料之研究與應用

The Study and Application of Holographic Materials Based on Dye-doped Liquid Crystals

蘇威佳(Wei-Chia Su) ； 林慧慈(Hiu-Tzu Lin) ； 陳立芃(Li-Peng Chen) ； 蕭玄宜(Hsuan-Yi Hsiao)

《光學工程》 120期 (2012/12) Pp. 46-51

https://doi.org/10.30011/OE.201212.0005

摘要

本篇研究探討摻雜染料之液晶其極化全像的光學紀錄特性，其中我們提出了一種有效增強繞射效率的方法，在記錄時使用不同比例的光強度記錄，當兩道記錄光的光強度比為7:1，極化光柵的繞射效率可到達23%，此效率是記錄光的光強度比為1:1時的三倍。此外我們利用全像記錄過程中染料會吸附在基板上之特性，成功製造出在可以抹除且反覆使用的液晶全像材料中，進行非破壞性讀取的方式，此方式是使用同一種波長之雷射光進行抹除與讀取，已被記錄的全像訊息可透過照射p偏振光輕易消除，而使用s偏振光則可在不破壞全像訊息之情況下，重建儲存資訊。

關鍵字

染料摻雜液晶 ； 極化全像 ； 非揮發性 ； 可複寫記憶體

並列摘要

We present our study on holographic recording property in dye-doped liquid crystal films in this paper. We find one effective way to enhance the diffraction efficiency of a polarization hologram in dye-doped liquid crystal films is using two orthogonal polarization recording beams with unequal intensity during recording process. The increased diffraction efficiency of the polarization holograms is 23% in a when the intensity ratio of two recording beams is 7:1, which is almost triple times of that when the beam ratio of two recording beams is 1:1. In addition, the nonvolatile reading of erasable polarization holograms in dye-doped liquid crystal films can be achieved using the same writing wavelength. The nonvolatile reading in dye-doped liquid crystal films is attributed to the dye adsorption effect. We find s-polarized wave can be used as for nonvolatile readout and a p-polarized wave can be used to erase the holographic gratings effectively.

並列關鍵字

dye-doped liquid crystal ； polarization hologram ； nonvolatile ； rewritable memory