期刊
ACS PHOTONICS
卷 6, 期 1, 页码 43-49出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b01365
关键词
dielectric nanoparticles; chirality; enantiomer separation; Mie resonances; Kerker conditions
类别
资金
- Gordon and Betty Moore Foundation through a Moore Inventors Fellowship
- Alfred P. Sloan Foundation
- National Defense Science and Engineering
- AFOSR PECASE Grant [FA9550-15-1-0006]
- Gipuzkoako Foru Aldundia through FEDER Una Manera de hater Europa
- Basque Government [PI-2016-1-0041]
- ELKARTEK Program through MICRO4-FAB Project [KK-2016/00030]
- ELKARTEK Program through mu4F Project [KK2017/00089]
Circularly polarized light (CPL) exhibits an enantioselective interaction with chiral molecules, providing a pathway toward all-optical chiral resolution. High index dielectric nanoparticles have been shown to enhance this relationship, but with a spatially varying sign (or enantiospecificity) that yields a near zero spatially averaged enhancement. Using full field electromagnetic simulations, we design metasurfaces consisting of high index dielectric disks that provide large-volume, uniform-sign enhancements in both the optical density of chirality, C (the figure of merit for sensing and spectroscopy), and Kuhn's dissymmetry factor, g (the figure of merit for separation). By varying disk radius, we achieve local enhancements in C and g up to 138-fold and 15-fold, respectively, as well as volumetric enhancements of 30-fold and 4.2-fold. The uniform-sign enhancements in C occur near the first Kerker condition, where overlapping electric and magnetic modes maximize field strength and preserve the pi/2 phase lag between the electric and magnetic fields of CPL; in contrast, uniform sign enhancements in g occur with spectrally separated modes, where fields and phase remain optimal without reduced molecular absorption. Using first-order kinetics of the molecule thiocamphor, we show how this optically enantiopure metasurface could enable 20% enantiomeric excesses with a >2000-fold increase in yield for a photoionization reaction compared to CPL alone.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据