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Backward stimulated Bragg scattering in multiphoton active CdTe(x)Se(1-x) quantum dots system.
Guang S He1, Jing Zhu, Ken-Tye Yong
1Institute for Lasers, Photonics and Biophotonics, State University of New York at Buffalo, New York 14260-3000, USA. gshe@buffalo.edu
The Journal of Chemical Physics
|December 9, 2009
Summary
CdTeSe quantum dots demonstrate efficient backward stimulated Bragg scattering (SBgS) and multiphoton absorption. These properties enhance optical limiting performance, showing significant nonlinear transmission changes under laser irradiation.
Area of Science:
- Nonlinear Optics
- Quantum Dot Photonics
- Materials Science
Background:
- Quantum dots (QDs) are nanomaterials with tunable optical properties.
- Stimulated Bragg scattering (SBgS) is a nonlinear optical phenomenon.
- Optical limiting is crucial for protecting sensors from laser damage.
Purpose of the Study:
- Investigate backward stimulated Bragg scattering (SBgS) in CdTe(x)Se(1-x) quantum dots.
- Characterize the spectral and temporal properties of SBgS.
- Evaluate the potential for enhanced optical limiting.
Main Methods:
- Utilized nanosecond pulsed lasers at 532, 816, and 1064 nm.
- Measured pump threshold dependence on QD concentration.
- Analyzed spectral and temporal structures of the scattered light.
- Quantified energy conversion efficiency and nonlinear transmissivity.
Main Results:
- Observed efficient SBgS with energy conversion efficiency >= 14%.
- Demonstrated multiphoton absorption (two- and three-photon) across investigated wavelengths.
- Achieved significant optical limiting, reducing transmissivity from ~0.73 to ~0.17 (532 nm) and ~0.9 to ~0.35 (816 nm).
Conclusions:
- CdTeSe QDs exhibit strong nonlinear optical responses.
- Both SBgS and multiphoton absorption contribute to enhanced optical limiting.
- These QDs show promise for advanced optical protection applications.
