https://scholars.lib.ntu.edu.tw/handle/123456789/598827
標題: | Winding Poynting vector of light around plasmonic nanostructure | 作者: | Ku Y.-C Kuo M.-K Liaw J.-W. MAO-KUEN KUO |
關鍵字: | 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;Gold;Integral equations;Nanostructures;Plasmonics;Sailing vessels;Titanium dioxide;Vectors;Vortex flow;Winding;Boundary-element methods;Fredholm's integral equation;Greens function;Optical vortices;Poynting's vectors;Stratton-chu formulation;Surface-plasmon resonance;Electromagnetic waves | 公開日期: | 2022 | 卷: | 278 | 來源出版物: | Journal of Quantitative Spectroscopy and Radiative Transfer | 摘要: | 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. ? 2021 |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120826263&doi=10.1016%2fj.jqsrt.2021.108005&partnerID=40&md5=4b212a0d250c2dfff89acf92d2ee849b https://scholars.lib.ntu.edu.tw/handle/123456789/598827 |
ISSN: | 00224073 | DOI: | 10.1016/j.jqsrt.2021.108005 |
顯示於: | 應用力學研究所 |
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