Engineering high-performance dielectric chiral shells with enhanced chiral fields for sensitive chiral biosensor  

作　　者：Yi-Fan Wang Shan-Shan Huang Zhen-Dong Dai Shi-Lin Xian Xuan-Nan Wu Fu-Hua Gao Yi-Dong Hou 

机构地区：[1]College of Physics,Sichuan University,Chengdu,610065,China [2]Graduate School of Sichuan University,Sichuan University,Chengdu,610065,China

出　　处：《Rare Metals》2024年第3期1197-1206,共10页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.11604227);International Visiting Program for Excellent Young Scholars of SCU(No.20181504);International Science and Technology Innovation Cooperation of Sichuan Province(No.21GJHZ0230)。

摘　　要：Chiral metamaterials have been a topic of significant research interest in recent years due to their potential for various applications in nanophotonic devices and chiral biosensors.However,the intrinsic Ohmic loss in surface plasmonic resonance has limited their practical use,resulting in large light dissipation and weak chiroptical resonance.Here,we report on the development of high-performance dielectric chiral shells(DCS)through a two-step Si deposition process on a self-assembled microsphere monolayer.The form DCS sample completely oyercomes the cancelation effect originated from the disorder property of the micro-sphere monolayer in macroscale,and at a wavelength of approximately 710 nm,the measured optimal chiral signal(g-factor)and transmittance can reach up to 0.7 and 0.3,respectively.The strong chiroptical effect comes from the asymmetric circular displacement currents(i.e.,magnetic modes)enabled by the specific shell geometry.The chiral shell geometry,electromagnetic properties,sensor sensitivity of chiral molecules and figure of merit are systematically investigated.The DCSs demonstrate highly sensitive detection of chiral biomolecules owing to their easily accessible geometry and enhanced uniform chiral field.

关 键 词：Dielectric chiral shells(DCS) Si deposition Magnetic resonance Highly sensitive sensor Chiral field 

分 类 号：TB34[一般工业技术—材料科学与工程] TP212.3[自动化与计算机技术—检测技术与自动化装置]