期刊
ACS NANO
卷 15, 期 10, 页码 16802-16810出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c07137
关键词
chirality; localized surface plasmon resonance; photoemission electron microscopy; near-field imaging; mode interference
类别
资金
- JSPS KAKENHI [JP18H05205 JP18K05053, JP18H03882, JP20H05083, JP21H04657]
- Nanotechnology Platform (Hokkaido University)
- Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials (Five-Star Alliance) of MEXT
The study examines the chiral near-field intensity distribution on achiral gold nanorectangular structures under circularly polarized light, attributing the extrinsic chirality to the interference between two plasmonic modes. The intensity and phase angle of each mode under linearly polarized light are critical factors for the generation of extrinsic chirality in the near-field intensity distribution.
The optical near field (NF) induced by circularly polarized light (CPL) is a hot scientific topic. We observed a chiral NF intensity distribution on a series of achiral gold nanorectangular structures (Au-NRs) under CPL irradiation by using multiphoton photoemission electron microscopy (MP-PEEM). Additionally, the differential NF spectra under left and right CPL irradiation, which represent the asymmetry of the NF intensity distribution, were investigated. We propose an interpretation that the chiral NF intensity distribution on an achiral metallic nanostructure is extrinsically generated by the interference between two plasmonic modes by combining state-of-the-art MP-PEEM techniques and the classical oscillator model. Our interpretation well explains both the experimental and simulation results. Furthermore, the intensity of the NF and its phase angle of each mode under linearly polarized light irradiation were revealed to be critical factors for the generation of extrinsic chirality in the NF intensity distribution.
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