multi-band ultra-sharp transmission response in all-dielectric resonant structures containing kerr nonlinear media

All-dielectric resonant structure (adrs) consisting of high-index nonlinear dielectrics has been theoretically and numerically demonstrated with multi-band ultra-sharp transmission response in this work. bandwidth down to sub-nanometer and spectral q-factor up to 920 are achieved in this adrs-based metamaterial-like platform. strong resonant electric field distributions by the high-index dielectric resonators and efficient coupling between the layered dielectric particles and the cavity mainly contribute to the multiple narrowband light transmission filtering. by using a kerr nonlinear medium as the resonant dielectric, the positions of the transmission dips in the spectrum can be actively tuned by the incident light intensity. due to the ultra-narrow spectral feature and the strong electric field distribution by the resonators, an efficient all-optical switching behavior with high spectral difference intensity and contrast ratio is obtained. further study presents the observed multi-band transmission with high scalability by tuning the structural parameters. these optical features hold the predicted adrs be potentially applied to constructing dielectric metamaterial-based all-optical switching or active subtractive transmission filtering with low power threshold at sub-diffraction scale.