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Nonlinear optical properties of CdTe QDs near the resonance regime

I. DANCUS1,* , V. I. VLAD1, A. PETRIS1, N. GAPONIK2, A. SHAVEL2, A. EYCHMÜLLER2

Affiliation

  1. National Institute for Lasers, Plasma and Radiation Physics, Bucharest-Magurele, Romania
  2. Physical Chemistry/Electrochemistry, TU Dresden, Germany

Abstract

In this paper, we are studying the sign changes of the nonlinear refractive index of CdTe quantum dots (QDs) function of the light wavelength around the resonance. This dependence of the nonlinear refractive index sign is of importance for the control of the nonlinear focusing/defocusing by changing the excitation wavelength only. With the QD samples we also observed a strong enhancement of the nonlinear refractive index with respect to the bulk material which is a consequence of the QD material being in the strong quantum confinement regime and near to the resonance excitation. A Z-Scan experimental setup is used to determine the nonlinear refractive index of the CdTe QDs. A simple method is proposed to avoid thermo-optical effects by using chopped and c.w. lasers as light sourcse for the Z-Scan experiments..

Keywords

Nonlinear refractive index, Z-Scan, Thermo-optical effects, CdTe, Quantum dots.

Submitted at: Jan. 14, 2008
Accepted at: Jan. 18, 2008

Citation

I. DANCUS, V. I. VLAD, A. PETRIS, N. GAPONIK, A. SHAVEL, A. EYCHMÜLLER, Nonlinear optical properties of CdTe QDs near the resonance regime, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 1, pp. 149-151 (2008)