一种测量圆二色性的椭圆调制器  

A Modulator of Elliptically Polarized Light to Measure Circular Dichroism

作　　者：陶卫东[1] 潘雪丰[1] 王标[1] 白贵儒[2] 

机构地区：[1]宁波大学理学院,浙江宁波315211 [2]宁波大学光纤通信与网络技术研究所,浙江宁波315211

出　　处：《光电子．激光》2007年第4期425-427,共3页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60307003);国家科技部"973"资助项目(2003CCA00800;2004CB719805)

摘　　要：提出了一种测量圆二色性的新方法。采用起偏器和菲涅尔棱体组成的椭圆偏振光调制器,产生出特定的椭圆偏振光,使之通过样品并抵消因样品吸收引起的圆二色性差异。利用零补偿原理,从而计算出样品的圆二色性值,计算表明,入射角变化±2°时,椭圆偏振光调制器的总相位延迟量偏差不超过0.46°,满足测量所需。A new measurement of circular dichroism is proposed in this paper. The modulator which can produce special dliptically polarized light is composed of polarizer and Fresnel prism. The elliptically polarized light is passed through the sample and the difference of circular dichroism is commuted. Using the zero-expiation theory,the circular dichrosm of the sample can be, obtained. The calculation shows that the phase departure of this modulator is less than 0. 46° when the angle of incidence changes between -2° and ＋2° which can satisfy the requirements of measurement.

关 键 词：零补偿 手征介质 圆二色性 椭圆偏振光 

分 类 号：TH744.2[机械工程—光学工程]