Experimental Studies of Intriguing Effects of Laser-Induced Thermal Gradient in Different Domains of Light-Matter Interactions: From Nonlinear Optical Effects in Organic Molecules to Helicity-Dependent Current in Topological Insulators

Roy, Samrat (2023) Experimental Studies of Intriguing Effects of Laser-Induced Thermal Gradient in Different Domains of Light-Matter Interactions: From Nonlinear Optical Effects in Organic Molecules to Helicity-Dependent Current in Topological Insulators. PhD thesis, Indian Institute of Science Education and Research Kolkata.

Text (PhD thesis of Samrat Roy (16RS058)) 16RS058.pdf - Submitted Version Restricted to Repository staff only Download (4MB)

Abstract

Irradiation by an intense laser beam can cause many interesting photophysical processes in different materials. When an intense laser beam passes through any medium, it leads to a temperature rise in the medium. This temperature rise depends on the intensity profile of the laser beam cross section. For a Gaussian laser beam, at the center, the temperature rise is more with respect to the periphery, resulting in a transverse (to the beam propagation direction) thermal gradient in the sample. Thermal gradient plays important role in many phenomena related to light-matter interaction. In this thesis, I have focused on the intriguing effects of laser-induced thermal gradient on optical, thermal, and transport properties in diverse materials in solid and liquid forms. I have studied the effect of the laser-induced thermal gradient on refractive index and also on spin-polarized photocurrent.

Actions (login required)

View Item