在摻雜偶氮染料液晶薄膜產生全像光柵的動態研究

Studies of Dynamics of the Laser-Induced Holographic Gratings Based on Dye-doped Liquid Crystal Films

吳聲廣(Sheng-kuang Wu)

指導教授 ： 莫定山

崑山科技大學/工程學院/電子工程研究所/碩士(2007年)

https://doi.org/10.6828/KSU.2007.00044

摘要

本論文利用雷射引致偶氮染料吸附製作全像光柵，藉由改變激發光強度、時間及偵測光偏振方向，來研究全像光柵形成時的動態研究。在此研究中，在不同的激發光強度及時間照射下，發現一階繞射光強度深受激發光的強度及時間影響。且藉由不同的偵測光偏振方向所觀測到的一階繞射形成期間的不同反應，發現光柵形成時除了受偶氮染料分子吸附造成影響之外，亦有薄膜內液晶分子受激發染料分子產生力矩而有排向改變的情形發生。

關鍵字

偶氮染料

並列摘要

Laser-Induced holographic Gratings in dye-doped liquid-crystal films has been investigated by changing the intensity of the two writing beams, the time of the two writing beams and the polarization of probe beam. The cw Ar+ laser has been employed as the writing beams and the cw He-Ne laser has been employed as a real-time probe beam to detect the first order of diffraction singals. In this research, The use differently pump of intensity and under the pump of time. The discovery pump light intensity is prompt is separated the influence diffraction grating formation Different the first order diffraction, which detects the light direction of polarization to observe is different. We propose the explanation,the pump of intensity,pump time and the polarization of probe beam to tests the result the influence.

並列關鍵字

AZO dye

參考文獻

[3] P. gde Gennes and J. prost, The Physics of Liquid Crystalsm,2nd ed.,Clarendon Press, Oxford (1993).

[4] M Blinov and V.G. Chigrinov, “Electrooptic Effects in Liquid Crystal Materials”, Springer-Verlag, New York (1994).

[5] P. G. de Gennes and J. Prost, “The physics of Liquid Crystals”, 2nd ed., Clarendon Press, Oxford (1993).

[11] I. Jánossy and A.D. Lloyd, Mol. Cryst. Liq. Cryst. 203, 74 (1991).

[12] I. Jánossy, L. Csillag, A.D. Lloyd, Phys. Rev. A, 44, 8410 (1991).