多层球壳结构中等离激元与手性分子的相互作用  

Interaction between sueface plasmons and chiral molecules in multilayer core-shell structure

作　　者：杨泽华 郭杨喆 方蔚瑞 YANG Zehua;GUO Yangzhe;FANG Yurui(School of Physics,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学物理学院,辽宁大连116024

出　　处：《陕西师范大学学报（自然科学版）》2022年第1期1-11,共11页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金(12074054,11704058);中央高校基本科研业务费专项资金(DUT21LK06)。

摘　　要：利用扩展的Mie理论研究了手性分子与金属组成的复合纳米球体系的光学性质。结果表明:当圆偏振光入射到球壳结构(Au@手性分子@Au)上时,手性分子和表面等离激元发生相互作用,金核与金壳发生杂化,在表面等离激元共振位置处出现圆二色性(circular dichroism,CD)响应、Rabi劈裂和类激子诱导透明现象。当共振位置在近红外时,类激子诱导透明现象更加明显;当手性分子层振子强度增大时,分子诱导手性表面等离激元的能力提高。当分子层厚度增加时,导致的共振模体积的增加同样提高了等离激元诱导能力;当金壳层厚度增加时,在分子层形成较强手性场,可诱导出较强的CD信号。The optical properties of composed nanosphere system with chiral molecules and metal are investigated by extended Mie theory.The results show that when circularly polarized light incident the spherical shell structure of Au@chiral_molecule@Au,chiral molecules interact with surface plasmons and Au core hybrid with Au shell layer resulting in circular dichroism(CD)response,Rabi splitting and analogous exciton induce transparency in the resonance position.When molecules′response peak position is near infrared,the phenomenon will be more obvious.The ability of chiral molecules induce plasmonic chirality can be improved by increasing mode volume by increasing the thickness and oscillator strength of chiral layer.Thickened Au layer interacting with Au shell induced lager CD signal by producing strong chiral field.

关 键 词：球壳结构 强相互作用 表面等离激元 手性分子 MIE理论 

分 类 号：O643[理学—物理化学]