A Dedicated Modelling Scheme for Nonclassical Optical Response from the Nanosphere-on-Mirror Structure
IEEE Transactions on Microwave Theory and Techniques(2023)
摘要
Within the framework of the T-matrix method, we present a modeling tool that
predicts the optical response from the Nanosphere-on-Mirror (NSoM) construct.
The nonclassical effects in metals are accounted for by the nonlocal
hydrodynamic Drude model (NLHDM) or the surface response model (SRM). Two
essential elements in the T-matrix method, i.e., the T-matrix of the sphere and
the R matrix accounting for the effects of the mirror, have been fully upgraded
to include longitudinal waves for the NLHDM and the augmented interface
conditions for the SRM. The proposed tool is quantitatively validated both in
the near and the far field by an in-house developed BEM solver for the NLHDM
where the gap between the sphere and the mirror is as small as 1 nm. Two
physical checks are performed, where the results from the classical local
response model are compared with the ones from the NLHDM and the SRM. The
observed shifts in resonances and reduced field enhancements in the gap region
agree well with previous physical findings. The proposed tool may not only
serve as a reference tool for other numerical methods, but also provides an
ideal platform for investigating nonclassical optical processes in the NSoM,
hence paving a semi-analytical way to understand the extreme optics at very
small scales.
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关键词
Nanophotonics,nonclassical effects,nonlocal hydrodynamic model (NLHDM),surface response model (SRM),T-matrix method
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