We consider scattering of surface plasmon polaritons (SPPs) and light by individual high-refractive-index dielectric nanoparticles (NPs) located on a metal (gold) substrate and supporting electric and magnetic dipole resonances in the visible spectral range. Numerical calculations are carried out by making use of the discrete dipole approximation including the multipole decomposition procedure. Extinction and scattering cross section spectra of spheroid silicon NPs in visible and near-infrared are presented and discussed. The roles of the in-plane and out-of-plane components of electric and magnetic dipoles in the scattering processes are clarified and demonstrated. It is revealed that, owing to the NP interaction with electromagnetic fields reflected from the substrate (that leads to bianisotropy), the in-plane electric and magnetic dipoles can resonantly be excited at the same wavelength. Due to this effect, the resonant unidirectional (forward) and elastic (in-plane) scattering of SPPs by oblate spheroid NPs can be realized within a narrow spectral range. In the case of normal light incidence, the bianisotropy effect can provide significant suppression of the SPP excitation because of the destructive interference between the SPP waves generated by induced electric and magnetic dipole moments. The results obtained open new possibilities for the Development of SPP-based photonic components and metasurfaces, whose operation involves resonant excitations of dielectric NPs.
Polariton spectroscopy at the diamond K-edge via X-ray parametric down-conversion
The Hamburg Centre for Ultrafast Imaging（汉堡超快成像中心）；Department of Physics, University of Hamburg（汉堡大学物理系）；Deutsches Elektronen-Synchrotron DESY（德国电子同步辐射中心）；ESRF, The European Synchrotron（欧洲同步辐射光源）
Spin-momentum locking of polariton edge states in honeycomb lattices
Universidad Autónoma de Madrid（马德里自治大学）；Università di Padova（帕多瓦大学）；Indian Institute of Technology Bombay（孟买印度理工学院）；Indian Institute of Technology Dharwad（达尔瓦德印度理工学院）；Julius-Maximilians-Universität Würzburg（维尔茨堡朱利叶斯-马克西米利安大学）
Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg（斯特拉斯堡大学）；Universidad Autónoma de Madrid（马德里自治大学）；ESPCI Paris, Université PSL, CNRS, Sorbonne Université（巴黎高等物理化工大学）；Laboratoire de Physique et d’Étude des Matériaux, LPEM, UMR 8213（物质物理与研究所）
