Bochenkov Vladimir E, Sutherland Duncan S
Opt Express. 2018 Oct 15;26(21):27101-27108. doi: 10.1364/OE.26.027101.
Large-area arrays of substrate-supported plasmonic gold crescents are fabricated by using the new colloidal lithography technique, which is based on an in situ-deposited silica resistance layer. The method provides the means to control the particles' asymmetry just by changing the mutual deposition angle of gold and silica. Asymmetric crescent structures exhibit a pronounced circular dichroism in near-infrared region, with the chiral asymmetry factor reaching 0.2. According to the simulation, the optical chirality enhancement reaches between one and two orders of magnitude and is localized near the crescents' tips.
利用基于原位沉积二氧化硅电阻层的新型胶体光刻技术，制备了大面积的衬底支撑等离子体金新月阵列。该方法提供了一种仅通过改变金和二氧化硅的相互沉积角度来控制颗粒不对称性的手段。不对称新月结构在近红外区域表现出明显的圆二色性，手性不对称因子达到0.2。根据模拟，光学手性增强达到一到两个数量级，并局限于新月尖端附近。
