5. Theoretical Physics (CSN4)

Photothermal Lens Spectroscopy: A Highly Sensitive Technique for Characterization of Low Absorbing materials

by Zeinab Ebrahimpour1 (ICTP Trieste)

Aula Seminari (LNF)

Aula Seminari


Via Enrico Fermi, 40 00044 Frascati (Roma)

In order to characterize low absorbing materials, where UV-vis spectrophotometry does not provide enough sensitivity, other more sensitive methods are needed. Photothermal lens technique is a very sensitive method to detect and photothermal characterize of materials. The thermal lens technique measures the amount of heat generated followed by the absorption of light in a sample. The heat produces a temperature gradient in the medium which generates a spatial refractive index gradient called a thermal lens. The performance of this method and applications such as photocatalytical degradation of dyes as well as the photothermal characterization of plasmonic nanostructures, quantum dots and graphene are presented.