Highly efficient nonlinear optical emission from a subwavelength crystalline silicon cuboid mediated by supercavity mode.

ABSTRACT: The low quantum efficiency of silicon (Si) has been a long-standing challenge for scientists. Although improvement of quantum efficiency has been achieved in porous Si or Si quantum dots, highly efficient Si-based light sources prepared by using the current fabrication technooloy of Si chips are still being pursued. Here, we proposed a strategy, which exploits the intrinsic excitation of carriers at high temperatures, to modify the carrier dynamics in Si nanoparticles. We designed a Si/SiO₂ cuboid supporting a quasi-bound state in the continuum (quasi-BIC) and demonstrated the injection of dense electron-hole plasma via two-photon-induced absorption by resonantly exciting the quasi-BIC with femtosecond laser pulses. We observed a significant improvement in quantum efficiency by

SUBMITTER: Panmai M 

PROVIDER: S-EPMC9117321 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature