Modified Z-Scan Method for Determining Third-Order Nonlinearity of Quantum Dots in the Resonant Excitation Mode

E. A. Ponomareva; I. D. Skurlov; S. E. Putilin; A. N. Tsypkin; A. P. Litvin

doi:10.1134/S0030400X1902019X

Modified Z-Scan Method for Determining Third-Order Nonlinearity of Quantum Dots in the Resonant Excitation Mode

Authors: Ponomareva E.A.¹, Skurlov I.D.¹, Putilin S.E.¹, Tsypkin A.N.¹, Litvin A.P.¹
Affiliations:
1. ITMO University
Issue: Vol 125, No 6 (2018)
Pages: 1003-1005
Section: Nonlinear Optics
URL: https://journals.rcsi.science/0030-400X/article/view/165894
DOI: https://doi.org/10.1134/S0030400X1902019X
ID: 165894

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Abstract

A modified Z-scan method for determining the nonlinear refractive index of colloidal quantum dots in the near-IR spectral range in the resonant excitation mode is proposed. It is demonstrated that the thermal effects related to heating of the solution due to strong light absorption can be mitigated by reducing the probing pulse repetition rate. The nonlinear refractive index of colloidal lead sulfide quantum dots is found to be on the order of 10^–16 cm²/W.