與偏振無關之多穩態液晶光柵

Polarization-Independent Multistable Liquid Crystal Gratings

游勝富(Sheng-Fu Yu)

指導教授 ： 林蕙琪

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所在職專班/碩士(2013年)

摘要

在本論文中，我們利用十二氫氧基硬酯酸（12-Hydroxystearic Acid,HSA）摻雜向列相液晶材料製作與偏振無關且多穩態之液晶相位光柵，方法是使用TN (Twisted Nematic)配向之樣本搭配柵狀條紋圖案之電極，可藉由改變外加電壓與環境溫度之操作方式，可在無外加電壓下得到不同的繞射效率，所以此相位光柵具有多穩態以及省電的特性，此外直接外加電壓也可調控此光柵的繞射效率。具雙模(Dual mode)的一維及二維光柵隨電壓變化之繞射效率皆呈現於本文中。

關鍵字

向列相液晶 ； 多穩態 ； 與偏振無關光柵

並列摘要

In this study, we demonstrate a polarization-independent grating, which is fabricated with 12-hydroxyl stearic acid (HSA) doped twisted nematic (TN) cell with stripe-patterned electrode method. Thermoreversible association and dissociation of the gelator molecules can vary and fix the multistable diffraction efficiencies of the grating, which can be used to save power. Voltage can also be used to dynamically modulate the diffraction efficiencies of the grating, which behaves as a conventional LC device. The experimental results show that the variations of the diffraction efficiencies in the multistable and dynamic modes are very similar. The variations of diffraction efficiency of one dimension (1D) and two dimension (2D) gratings with voltage in such a dual mode are presented in this study.

並列關鍵字

twist nematic ； multistable ； polarization-independent grating

參考文獻

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