Multipole Resonances in Transdimensional Lattices of Plasmonic and Silicon Nanoparticles
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.152
Multipole Resonances in Transdimensional Lattices of Plasmonic and Silicon Nanoparticles Viktoriia E. Babicheva College of Optical Sciences, University of Arizona, USA email: [email protected]
ABSTRACT
Transdimensional photonics has emerged as a new field of science and engineering that explores the optical properties of materials and nanostructures in the translational regime between two and three dimensions. In the present work, we study an example of such transdimensional lattice consisting of nanoparticle array, and we aim at a direct comparison of lattice resonances excited in the periodic lattices of either plasmonic (gold) or silicon nanoparticles of the same size and interparticle spacing. We numerically analyze extinction cross-sections and reflection from the array, and we include electric and magnetic dipoles and electric quadrupoles into consideration. Lattice resonances are excited at the wavelength close to Rayleigh anomaly which is defined by the array periodicity, and different multipoles respond to one or another period of rectangular array depending on incident light polarization. We show that lattice resonances originating from dipole moments are extended to the larger spectral range than electric-quadrupole lattice resonances. Overlap of resonances causes a decrease in reflection (generalized Kerker effect) and, in the case of electric quadrupole and magnetic dipole moments, the coupling of the multipoles is enabled by the lattice.
INTRODUCTION Efficient light absorption and scattering from nanoparticles allow for subwavelength light manipulation with possible applications in ultra-thin optical components, photovoltaic devices, sensors, and others [1,2]. Optical properties of single nanoparticles and their clusters can be studied in terms of electric and magnetic multipoles (dipole, quadrupole, and higher orders) what has proven to be a robust tool in designing nanostructures with the desired properties and functionalities [3,4]. Plasmonic nanostructures (made of metal or metal-like material with effectively negative
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permittivity) have been widely studied mainly because of their extraordinary ability to confine light at the nanoscale [2,4-9]. However, the nanostructures suffer from significant non-radiative losses and heat dissipation. Both electric and magnetic responses from nanostructure are essential for efficient light control. The most common approach to excite magnetic resonance in plasmonic nanostructure is to design split-ring resonators, U-shape antenna, or sandwich a dielectric gap between metal layers. Such requirements considerably complicate the fabrication process and impose obstacles in the practical use of plasmonic nanostructures. Alternative solutions h
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