手性(物理)
圆二色性
纳米光子学
谐振器
电介质
材料科学
分子物理学
物理
纳米技术
光电子学
化学
结晶学
量子力学
对称性破坏
自发对称破缺
Nambu–Jona Lasinio模型
作者
Ershad Mohammadi,T. V. Raziman,Alberto G. Curto
出处
期刊:Nano Letters
[American Chemical Society]
日期:2023-05-01
卷期号:23 (9): 3978-3984
被引量:3
标识
DOI:10.1021/acs.nanolett.3c00739
摘要
Nanophotonics can boost the weak circular dichroism of chiral molecules. One mechanism for enhanced chiral sensing relies on using a resonator to create fields with high optical chirality at the molecular position. Here, we elucidate how the reverse interaction between molecules and the resonator, called chirality transfer, can produce stronger circular dichroism. The chiral analyte modifies the electric and magnetic dipole moments of the resonator, imprinting a chiral response on an otherwise achiral resonance. We demonstrate that silicon nanoparticles and metasurfaces tailored for chirality transfer generate chiroptical signals orders of magnitude higher than the contribution from optical chirality alone. We derive closed-form equations for the dependence of chirality transfer on molecular chirality, molecule-resonator distance, and Mie coefficients. We propose a dielectric metasurface for a 900-fold circular dichroism enhancement on the basis of these principles. Finally, we identify a fundamental limit to chirality transfer. Our findings thus establish key concepts for nanophotonic chiral sensing.
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