Showing papers by "Laura Pilozzi published in 2019"
TL;DR: Photonic crystal fibers and resonators with topological features induced by Aubry-Andre-Harper cladding modulation show topological protection against symmetry-preserving local perturbations that do not close the gap and sustain strong field localization and energy concentration at a given radial distance.
Abstract: We study photonic crystal fibers and ring resonators with topological features induced by Aubry- Andre-Harper modulations of the cladding. We find non trivial gaps and edge states at the interface between regions with different Chern numbers. We calculate the field profile and eigenvalue dispersion by an exact recursive approach. Compared with conventional circular resonators and fibers, the proposed structure features topological protection and hence robustness against symmetry-preserving local perturbations that do not close the gap. These topological photonic crystal fibers sustain strong field localization and energy concentration at a given radial distance. As topological light guiding and trapping devices, they may bring about many opportunities for both fundamentals and applications unachievable with conventional optical devices.
10 citations
01 Jun 2019
TL;DR: In this article, the authors propose optical resonators based on the edge modes of a cylindrical multilayer structure with nontrivial topological configuration and calculate the field confinement and resonator dispersion by a recursive approach.
Abstract: We propose optical resonators based on the edge modes of a cylindrical multilayer structure with nontrivial topological configuration. We calculate the field confinement and resonator dispersion by a recursive approach [1] able to tackle with arbitrary arrangements of annular concentric layers. We apply the method to a periodical structure with Harper modulation [2] and study the resulting cylindrical edge modes.