Abstract
A set of surface integral equations (SIEs) of Fredholm equations of the second kinds is used to study 3D light-matter interaction at the nanoscale, particularly for the plasmonic effect. Based on this method, we find that the streamline of Poynting vector (energy flux) winds along the long axis of a gold nanocuboid as irradiated by a circularly polarized light propagating in the short-axis direction; the transverse angular momentum is caused by the spin-orbit interaction of light via a plasmonic nanostructure. The spiral winding behavior of Poynting vector could be related to the helical surface currents. Moreover, we find that at an off-resonance frequency two vortexes of energy flux winding around specific corners of a gold nanocuboid are generated in the presence of a TiO2 substrate. This phenomenon may explain the cause of the selectivity of active sites for plasmon-enhanced chemical reaction. Our simulation method provides a deeper insight into the nanoscale light-matter interaction.
| Original language | English |
|---|---|
| Article number | 108005 |
| Journal | Journal of Quantitative Spectroscopy and Radiative Transfer |
| Volume | 278 |
| DOIs | |
| State | Published - 02 2022 |
Bibliographical note
Publisher Copyright:© 2021
Keywords
- Boundary element method
- Fredholm integral equation of the second kind
- Green's function
- Kernel function
- Method of moments
- N × RWG
- Nanocuboid
- Optical vortex
- Poynting vector
- Spin-orbit interaction
- Stratton-Chu formulation
- Surface charge
- Surface current
- Surface integral equations
- Surface plasmon resonance