Raman Scattering Nonlinearity by Photo-Themo-Optical Effect from Silicon Nanostructures

Mor Pal Vikram^1*, Kentaro Nishida¹, Chien-Hsuan Li¹, Olesiya Pashina², Daniil Ryabov², Yu-Lung Tang¹, Sergey Makarov^3,4, Junichi Takahara^5,6, Mihail Petrov², Shi-Wei Chu^1,7,8

¹Physics, National Taiwan University, Taipei, Taiwan
²Department of Physics and Engineering, ITMO, Saint peterburg, Russian Federation
³School of Physics and Engineering, ITMO university, Saint Peterburg, Russian Federation
⁴Qingdao Innovation and Development Center, Harbin Engineering University, Shandong, China
⁵Graduate School of Engineering, Osaka university, Osaka, Japan
⁶Photonics Center, Graduate School of Engineering, Osaka University, Osaka, Japan
⁷Molecular Imaging Center, National Taiwan University, Taipei, Taiwan
⁸Brain Research Center, National Tsing Hua University, Hsinchu, Taiwan

* Presenter:Mor Pal Vikram, email:d09222024@ntu.edu.tw

Silicon photonics have attracted interest due to their potential applications in photonics devices and the development of all-dielectric optical components. Recently, we have discovered giant photothermal nonlinearity in the scattering and absorption of crystalline silicon nanostructure. However, the photothermal effect on Raman scattering has not been explored yet. Here, we report that under intense laser excitation, the strong photo-thermo-optical effects lead to a nonlinear dependence of the Raman scattering, and in the Raman nonlinear region, the conventional Raman thermometry model shows temperature discrepancy. We show the first direct evidence of the Purcell effect contribution to nonlinear intrinsic Raman emission in all-dielectric Mie resonance nanostructures.

Keywords: Nonlinear nanophotonics, Mie resonance, Raman scattering, photothermal effect, silicon nanoparticles