单层过渡金属二硫化物增强手性金属纳米结构的圆二色性研究

手性金属纳米结构（CMNs）的圆二色性（CD）增强已经成为微纳光子学研究领域新的研究热点。目前针对CMNs的CD增强研究都是基于提高系统非对称性，但其CD响应受到光与CMNs耦合效率的严重制约。本项目拟通过引入单层过渡金属二硫化物（TMDs）提高圆偏振光与CMNs的耦合效率，探究TMDs增强CMNs的CD机制、CMNs/TMDs制备方法及其对手性分子CD的影响。具体研究内容包括：①设计不同的CMNs，研究CMNs表面等离激元共振与TMDs激子耦合规律，阐明CMNs的CD增强机制；②制备CMNs/TMDs，研究制备条件对其CD的调节机理，获得具有较强CD的CMNs/TMDs衬底；③建立CMNs/TMDs与手性分子库伦耦合模型，研究CMNs/TMDs对手性分子CD的影响规律，揭示手性分子CD增强机制。本项目研究结果将为CMNs的CD增强提供新的研究思路，并推动CMNs在手性分子检测方面的应用。

The enhancing of the circular dichroism (CD) of chiral metal nanostructures (CMNs) has become a new research focus in the field of micro-nanophotonics. Recently the study of the CD enhancing of CMNs is based on the increasing of the asymmetry of CMNs, while this CD is greatly restricted by the coupling efficiency between light and CMNs. The project will improve the coupling efficiency between circularly polarized lights and CMNs by introducing monolayer transition metal dichalcogenides (TMDs), and study the mechanism of TMDs enhancing the CD of CMNs, the preparation method of CMNs/TMDs, and the effect of CMNs/TMDs on the CD of chiral molecules. The specific researches include ① designing different CMNs, studying the coupling law between the surface plasmon resonance of CMNs and the exciton resonance of TMDs under different circularly polarized lights, and pinpointing the mechanism of TMDs enhancing the CD of CMNs; ② preparing CMNs/TMD, studying the regulating mechanism of the preparation conditions on their CD, and obtaining CMNs/TMD substrate with strong CD; ③ building the Coulomb coupling model between CMNs/TMD and chiral molecules, studying the influence rules of CMNs/TMDs on the CD spectra of chiral molecules, revealing the mechanism of the CD enhancing of chiral molecules. The results will provide new research ideas for CD enhancement of CMNs and promote the application of CMNs in the detection of chiral molecular.