%0 Journal Article %J Nano Lett %D 2021 %T Low-Loss Zero-Index Materials %A Haoning Tang %A Clayton DeVault %A Sarah Alejandra Camayd-Muñoz %A Yueyang Liu %A Danchen Jia %A Fan Du %A Olivia Mello %A Daryl I. Vulis %A Li, Yang %A Mazur, Eric %X

Abstract

Materials with a zero refractive index support electromagnetic modes that exhibit stationary phase profiles. While such materials have been realized across the visible and near-infrared spectral range, radiative and dissipative optical losses have hindered their development. We reduce losses in zero-index, on-chip photonic crystals by introducing high-Q resonances via resonance-trapped and symmetry-protected states. Using these approaches, we experimentally obtain quality factors of 2.6 × 103 and 7.8 × 103 at near-infrared wavelengths, corresponding to an order-of-magnitude reduction in propagation loss over previous designs. Our work presents a viable approach to fabricate zero-index on-chip nanophotonic devices with low-loss.

%B Nano Lett %V 21 %P 914-920 %G eng %U https://pubs.acs.org/doi/pdf/10.1021/acs.nanolett.0c03575 %N 2