Wang Yongkai, Li Zhiduo, Wang Qianying, Zhang Zhiyu, Lan Xiang, Han Qingyan, Zhu Lipeng, Zhang Chengyun, Zhao Xiaolong, Dong Jun
School of Electronic Engineering, Xi'an University of Posts & Telecommunications, Xi'an 710121, China.
School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China.
Phys Chem Chem Phys. 2022 Nov 30;24(46):28362-28370. doi: 10.1039/d2cp04072g.
Induced circular dichroism (ICD) is widely used in miniature polarizers, molecular detection, and negative refractive index media. However, enhancing and the dynamic regulation of ICD signals of achiral nanostructures in the visible and near-infrared range remain the current challenges. Here, monolayer borophene (MB) with anisotropic conductance was incorporated into achiral nanostructures, which consisted of achiral dielectric elliptical hole arrays (DENAs) placed on a silver substrate. Two narrowband ICD signals for DENAs/MB were achieved in the near-infrared range under different circularly polarized lights. The distributions of the magnetic field of DENAs/MB could explain the two narrowband ICD signals originating from the coupling of surface plasmon polariton resonances along the - and directions. Not only could the ICD signals be tuned by the structural parameters of DENAs/MB, but they could also be actively tuned by the incident angles of the excitation light and the carrier concentration of MB. In addition, the sensitivity and the figure of merit of DENAs/MB could reach 302/RIU and 61.0. These results provide a concise method for the design of dynamically adjustable chiral devices based on borophene and promote its application in molecular recognition and chiral catalysis.
诱导圆二色性（ICD）在微型偏振器、分子检测和负折射率介质中有着广泛应用。然而，在手性纳米结构的可见和近红外范围内增强和动态调节ICD信号仍然是当前面临的挑战。在此，将具有各向异性电导的单层硼烯（MB）引入到由置于银衬底上的非手性介电椭圆孔阵列（DENA）组成的非手性纳米结构中。在不同圆偏振光下，DENA/MB在近红外范围内实现了两个窄带ICD信号。DENA/MB的磁场分布可以解释这两个源于沿 - 和 方向的表面等离激元极化激元共振耦合的窄带ICD信号。ICD信号不仅可以通过DENA/MB的结构参数进行调节，还可以通过激发光的入射角和MB的载流子浓度进行主动调节。此外，DENA/MB的灵敏度和品质因数可分别达到302/RIU和61.0。这些结果为基于硼烯的动态可调手性器件设计提供了一种简洁方法，并推动了其在分子识别和手性催化中的应用。
