| Time：1100929 (Wed.) 14:20~16:20
Here is the link: meet.google.com/zyf-tkps-ure Speaker：Prof. 朱士維(CHU, Shi-Wei) 國立臺灣大學物理學系/Department of Physics, National Taiwan University Title：X-scan reveals giant photo-thermo-optical nonlinearity in a single nanostructure Abstract：Nonlinear light-matter interactions are essential toward communication, sensing, imaging, etc. The conventional method of quantifying optical nonlinearity is z-scan, which typically works with thin films, and thus acquires ensemble nonlinear responses, not from single nanostructure. Here we present an x-scan technique that is based on a confocal laser scanning microscope with both forward and backward detections, offering simultaneous quantification for nonlinear behavior of scattering, absorption and total attenuation from a single nanostructure. From x-scan, we found exceptionally strong nonlinear scattering/absorption in plasmonic and silicon nanostructures via photothermal and thermo-optical interactions. Potential applications, including high-contrast all-optical switching and non-bleaching super-resolution microscopy, are demonstrated. Place：B101, Gongquan Campuses, NTNU |
