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Nonlinear Optical Properties of CdSe Quantum Dots Having Different Sizes
Emusani Ramya1, Dushyant Kushavah2, M Veeramohan RaO3
1Department of Science and Humanities, MLR Institute of Technology, Dundigal 500043, Hyderabad, India.
Journal of Nanoscience and Nanotechnology
|July 27, 2020
Summary
We synthesized cadmium selenide quantum dots (CdSe QDs) with tunable sizes. Their optical properties were investigated, revealing potential applications as optical limiters.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Quantum dots (QDs) exhibit unique size-dependent optical properties.
- Cadmium selenide (CdSe) QDs are widely studied for their luminescence and electronic characteristics.
Purpose of the Study:
- To synthesize CdSe QDs of varying sizes.
- To characterize their linear and nonlinear optical properties.
- To explore their potential as optical limiters.
Main Methods:
- Synthesis of size-controlled CdSe QDs.
- Characterization using UV-Vis absorption, photoluminescence, and Transmission Electron Microscopy (TEM).
- Investigation of nonlinear optical properties via open-aperture Z-scan technique with a picosecond laser.
Main Results:
- Observed redshift in absorption and photoluminescence with increasing CdSe QD size (2.2 nm-4.9 nm).
- Demonstrated third-order nonlinear optical properties at 532 nm.
- Tuned bandgap properties of CdSe QDs.
Conclusions:
- CdSe QDs exhibit size-tunable optical properties.
- The synthesized CdSe QDs possess significant nonlinear optical responses.
- These CdSe QDs show promise for applications in optical limiting devices.
