Abstract: Nanoparticle clusters, such as oligomers, support modes with different symmetries resulting in Fano resonances. Moreover, periodic nanoparticle arrays give rise to lattice resonances at the wavelength close to the Rayleigh anomaly, i.e., effective wavelength in the medium is equal to the array period. Compared to a single nanoscatterer, drastic changes in the metastructure resonances can be induced by arranging nanoparticles into a periodic array. This often facilitates the excitation of additional resonances known as lattice resonances.
This talk will discuss metasurfaces and transdimensional metastructures for efficient directional scatterers and their arrays. The combination of different materials in the nanoparticle allows the tune of electric and magnetic resonances of the nanoparticles and achieving broadband overlap. The nanofabrication and characterization include sample preparation, deposition of metals and oxides, as well as optical measurements of reflection and transmission spectra. One or multiple nanoparticles (or scattering elements, or scatterers) are considered in the unit cell of the lattice unit. We introduce mismatched resonances excited in the array and show that the dimensions of scatterers define the type and character of excitations.
About the Speaker: Viktoriia Babicheva is an Asst. Prof. in the Department of Electrical and Computer Engineering at the University of New Mexico. Dr. Babicheva joined UNM after her postdoctoral appointment in the College of Optical Sciences at the University of Arizona, Tucson. Before that, Dr. Babicheva worked in the Birck Nanotechnology Center at Purdue University and Center for Nano-Optics at Georgia State University. Dr. Babicheva’s research focus is nanophotonics, nano-optics, and photonic materials, and the work specialization is localized and delocalized nanoparticle resonances in arrays, hyperbolic metamaterials, and near-field optical imaging of layered materials. Dr. Babicheva is the author and co-author of more than 60 peer-reviewed journal articles, 35 conference publications, and one book chapter. Dr. Babicheva has served as an Associate Editor for MRS Advances since 2021.