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

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, a...

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Bibliographic Details
Published in:Applied physics letters 2023-12, Vol.123 (25)
Main Authors: Gonçalves, Igor M., Medda, Anusri, Bautista, Jessica E. Q., Campos, Cecília L. A. V., Ghosh, Soubhik, Patra, Amitava, Gomes, Anderson S. L.
Format: Article
Language:English
Subjects:
Absorptivity
Applied physics
Excitation spectra
Femtosecond pulses
Nonlinear optics
Nonlinear response
Platelets (materials)
Refraction
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0178578