RESONANT Z-SCAN MEASUREMENT OF NON-LINEAR PROPERTIES OF COLLOIDAL LEAD SULFIDE QUANTUM DOTS

1 SKURLOV Ivan
Co-authors:
1 PONOMAREVA Evgenia 1 PUTILIN Sergey 1 DUBAVIK Aleksei POPOV,Aliaksei 1 TSYPKIN Anton 1 LITVIN Aleksandr
Institution:
1 ITMO University, Saint-Petersburg, Russia, ivan.skurlov.23@gmail.com
Conference:
10th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 17th - 19th 2018
Proceedings:
Proceedings 10th International Conference on Nanomaterials - Research & Application
Pages:
36-40
ISBN:
978-80-87294-89-5
ISSN:
2694-930X
Published:
28th February 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
32 views / 12 downloads
Abstract

Studying the nonlinearities in the resonant mode one may face thermo-optical effects due to sample overheating, occurring upon exposure to high-frequency repetition rate probing pulse. If present, thermo-optical contribution to the refractive index are extremely hard to separate from the electronic contribution. In order to obtain purely electronic non-linear change in refractive index and to avoid thermal effects we modify classic Z-scan method to operate with low probing laser pulse repetition rate of 1 Hz. In our work, we present results of a Z-scan measured non-linear refraction coefficient of colloidal PbS QDs of different sizes free from thermal contribution. Our measured values of nonlinear refractive index is in order of 10-16 cm2/W and independent on the QD concentration in the solution.

Keywords: Nanocrystals, quantum dots, lead sulfide, z-scan, non-linear refraction
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