Subwavelength dielectric resonators for nonlinear nanophotonics

Subwavelength optical resonators made of high-index dielectric materials provide efficient ways to manipulate light at the nanoscale through mode interferences and enhancement of both electric and magnetic fields. Such Mie-resonant dielectric structures have low absorption, and their functionalities are limited predominantly by radiative losses. We implement a new physical mechanism for suppressing radiative losses of individual nanoscale resonators to engineer special modes with high quality factors: optical bound states in the continuum (BICs). We demonstrate that an individual subwavelength dielectric resonator hosting a BIC mode can boost nonlinear effects increasing second-harmonic generation efficiency.…

• NR
  National Research Foundation of Korea

  Award: 2018R1A3A3000666
• RS
  Russian Science Foundation

  Award: 18-72-10140
• AR
  Australian Research Council