Saturable absorption and third-order nonlinear refraction of 2D CdSe nanoplatelets resonant with heavy-hole excitonic transitions

Author:

Gonçalves Igor M.1ORCID,Medda Anusri2ORCID,Bautista Jessica E. Q.1ORCID,Campos Cecília L. A. V.1ORCID,Ghosh Soubhik2ORCID,Patra Amitava23ORCID,Gomes Anderson S. L.1ORCID

Affiliation:

1. Departamento de Física, Universidade Federal de Pernambuco 1 , 50670-901 Recife-PE, Brazil

2. School of Materials Sciences, Indian Association for the Cultivation of Science 2 , Jadavpur, Kolkata 700032, India

3. Institute of Nano Science and Technology 3 , Knowledge City, Sector 81, Mohali 140306, India

Abstract

We report on the nonlinear optical response of CdSe nanoplatelets and CdSe/CdS core/shell nanoplatelets in the heavy-hole resonant excitonic transition spectral regions with femtosecond pulses. The nonlinear refraction and saturable absorption coefficients were obtained using the Z-scan technique, and the results were explained theoretically. The nonlinear optical response under nonresonant excitation has been previously examined; comparing with the results presented in this work, at least a one order of magnitude increase in the nonlinear refraction coefficient is evident.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

INCT Photonics Project

UGC and CSIR

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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