Li Ying, Bai Yu, Zhang Ziyan, Abudukelimu Abuduwaili, Ren Yaqi, Muhammad Ikram, Li Qi, Zhang Zhongyue
Appl Opt. 2021 Aug 10;60(23):6742-6747. doi: 10.1364/AO.432156.
Circular dichroism (CD) demonstrates broad application prospects in enantioselective catalysis, chiral separation, and ultrasensitive detection. Increasing the CD intensity of easily fabricated plasmonic nanostructures will promote the application of these artificial nanostructures. A chiral plasmonic system that consists of two unaligned nanorods and a metal film is proposed in this study to achieve a large CD effect. Indirect coupling of a nanorod-film-nanorod in the proposed chiral plasmonic system generates a larger CD intensity compared to the direct coupling of a nanorod-nanorod. In addition, the effects of structural parameters on the CD effect of the proposed system are numerically investigated. Results showed that the indirect coupling is strongly dependent on the separation between the nanorod and the metal film. The results of this study can provide an effective strategy to enhance the CD effect of plasmonic chiral systems.
圆二色性（CD）在对映选择性催化、手性分离和超灵敏检测方面展现出广阔的应用前景。提高易于制备的等离子体纳米结构的圆二色性强度将推动这些人工纳米结构的应用。本研究提出了一种由两个未对齐的纳米棒和一个金属膜组成的手性等离子体系统，以实现大的圆二色性效应。与纳米棒 - 纳米棒的直接耦合相比，所提出的手性等离子体系统中纳米棒 - 膜 - 纳米棒的间接耦合产生更大的圆二色性强度。此外，还对结构参数对所提出系统的圆二色性效应的影响进行了数值研究。结果表明，间接耦合强烈依赖于纳米棒与金属膜之间的间距。本研究结果可为增强等离子体手性系统的圆二色性效应提供有效策略。
