Ultra High Q and Widely Tunable Mie Resonance Nanofilter at Telecom Wavelengths

Abstract

Mie resonators offer a novel way for the subwavelength localization of light, showing large local field enhancement without metal optical absorption. In this paper, an ultra-high quality factor Q and widely tunable Mie resonance nanofilter at telecom wavelengths is presented. The loss mechanisms in this hybrid resonators are systematically analyzed. A selected high-index Ge disk embedded at the center of plasmonic nanocavity acts well as a Mie resonator for coupling the incident light. Based on the theoretical analysis and modeling, a widely tunable spectra linewidth from 14.2 nm to 1.2 nm and the maximum corresponding Q as high as 1292 is achieved. The Mie resonance nanofilters provide the possibility to make high performance and practical resonance component for nanophotonics integration.