Photothermal nonlinear scatterings in silicon nanostructures and applications to super-resolution microscopy
Journal
2025 25th Anniversary International Conference on Transparent Optical Networks (ICTON)
Start Page
1-2
Date Issued
2025-07-06
Author(s)
Nishida, Kentaro
Abstract
Nonlinear optical properties of the silicon nanostructures have attracted attention to extend the application of silicon photonics toward all-optical switching and super-resolution optical microscopy. In particular, our group discovered that the use of iterative photothermal and thermo-optic effects on Mie-resonant silicon nanostructure is the key to inducing the strong nonlinear relationships between scattering intensity and excitation intensity, with an effective nonlinear coefficient at a few orders larger scale than the Kerr nonlinearity. In this talk, we present our recent research effort to further enhance the nonlinearity via exploiting several different physical mechanisms: quasi-perfect absorbing Huygens' metasurface, displaced excitation by tightly focused laser, and optical bistability. In addition, we applied the nonlinear scattering responses of silicon nanostructures to improve the spatial resolution in laser scanning scattering microscopy. By using our home-built super-resolution imaging technique, we clearly observed densely located silicon nanostructures, which were not possible to resolve in conventional optical microscopy, with the non-label and non-contact advantages.
Subjects
nanophotonics
nonlinear
photothermal
silicon nanostructure
super-resolution
Publisher
IEEE
Type
conference proceedings