Abstract
Chiral metamaterials have been a topic of sig-nificant 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 micro-sphere monolayer.The form DCS sample completely overcomes the cancelation effect originated from the dis-order property of the micro-sphere monolayer in macro-scale,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 chi-roptical effect comes from the asymmetric circular dis-placement currents(i.e.,magnetic modes)enabled by the specific shell geometry.The chiral shell geometry,elec-tromagnetic properties,sensor sensitivity of chiral mole-cules 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.
基金项目
National Natural Science Foundation of China(11604227)
International Visiting Program for Excellent Young Scholars of SCU(20181504)
International Science and Technology Innovation Cooperation of Sichuan Province(21GJHZ0230)
NETL
NSTL
万方数据