Effect of topological inclusions on properties of resonant optical lattices

Abstract

The objective of the research is to develop new technological solutions grounded in the resonance properties of periodic photonic lattices. Our subwavelength lattices are designed to generate out-of-plane resonance radiation producing nonconventional dynamic spectra and field profiles. By tailoring one-dimensional or two-dimensional periodic films, high-efficiency output radiation is enabled by bright or dark resonant channels. Topological variants in the form of lattice-lattice interfaces are reviewed, demonstrating interesting band transitions and energy concentration gradients at the interface inclusion. Employing spun perovskite films, experimental characteristics of energy accumulation and reradiation from topological edge states in guided-mode resonance are provided. Particularly, edge-state resonance implements highly directional light emission with small divergence as experimentally quantified. To study conceptually different topological inclusions, we incorporate structural defects within the resonance lattices to bring out the dark-state resonance. This idea is grounded in substantive theoretical modeling that shows the existence of novel resonance states enabled by such lattice modifications. The interface and defect radiation modes and attendant mechanisms reported can be applied to fashion diverse resonance spectra in a host of lattice architectures embodied with dielectrics, semiconductors, and metals with widely varying constitutive parameters. These basic studies and results have potential for founding new modalities of light control in metamaterials and metasurfaces based on topological interfaces and discrete perturbations.