Hodgkinson I, Wu Q H, Knight B, Lakhtakia A, Robbie K
Department of Physics, University of Otago, P.O. Box 56, Dunedin, New Zealand.
Appl Opt. 2000 Feb 1;39(4):642-9. doi: 10.1364/ao.39.000642.
We present the technique of bideposition to realize thin-film helicoidal bianisotropic mediums (TFHBM's) that exhibit high optical activity. We show, by experiment as well as by simulation, that the optical rotation produced by these chiral sculptured thin films is roughly proportional to the square of the local linear birefringence. Experimental measurements on bideposited TFHBM's of titanium oxide yield a typical value of 5 degrees /mum for the effective specific rotation in the short-wavelength regime; the corresponding value determined for the standard unideposited TFHBM's is 1 degrees /mum. Both types of TFHBM's are highly optically active in comparison with quartz, fluorite films, and cholesteric liquid crystals. Bideposited TFHBM's will lend themselves to many different types of optical devices.
我们介绍了一种双沉积技术，以实现具有高光活性的薄膜螺旋双各向异性介质（TFHBM）。通过实验和模拟，我们表明这些手性雕刻薄膜产生的旋光性大致与局部线性双折射的平方成正比。对双沉积的氧化钛TFHBM进行的实验测量得出，在短波长范围内有效比旋光度的典型值为5度/微米；标准单沉积TFHBM的相应值为1度/微米。与石英、萤石薄膜和胆甾型液晶相比，这两种类型的TFHBM都具有很高的光活性。双沉积TFHBM将适用于许多不同类型的光学器件。
