Ultrasensitive Photothermal Switching with Resonant Silicon Metasurfaces at Visible Bands.

ABSTRACT: Dynamic access to quasi-bound states in the continuum (q-BICs) offers a highly desired platform for silicon-based active nanophotonic applications, while the prevailing tuning approaches by free carrier injections via an all-optical stimulus are yet limited to THz and infrared ranges and are less effective in visible bands. In this work, we present the realization of active manipulations on q-BICs for nanoscale optical switching in the visible by introducing a local index perturbation through a photothermal mechanism. The sharp q-BIC resonance exhibits an ultrasensitive susceptibility to the complex index perturbation, which can be flexibly fulfilled by optical heating of silicon. Consequently, a mild pump intensity of 1 MW/cm² can yield a modification of the imaginary part of t

SUBMITTER: Che Y 

PROVIDER: S-EPMC10798257 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature