Broadband, low-threshold optically pumped lasing based on CdS/CdSe/CdS spherical quantum wells in Si-based nanopillar optical cavities

Anton V. Malko

doi:10.1117/12.3001082

9 April 2024 Broadband, low-threshold optically pumped lasing based on CdS/CdSe/CdS spherical quantum wells in Si-based nanopillar optical cavities

Anton V. Malko

Author Affiliations +

Proceedings Volume PC12874, Nanoscale and Quantum Materials: From Synthesis and Laser Processing to Applications 2024; PC128740E (2024) https://doi.org/10.1117/12.3001082
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

We demonstrate broadband, tunable wavelength lasing emission using spherical CdS/CdSe/CdS quantum shells (QS) incorporated into distributed feedback (DFB) nanopillar Si cavities. Such QSs have recently attracted considerable attention as they exhibit strongly suppressed Auger recombination, ultralong biexciton (BX) lifetimes and broad gain bandwidth. Using only one QSs size (i.e., confinement), we demonstrate emission coupling and low threshold, narrowband lasing across wide spectral range, from single exciton (X~640 nm) to biexciton (BX~625 nm) to multiple exciton (MX~615-565 nm) transitions. The ensemble-averaged gain threshold of < N>~1.4 electron-hole pairs per QS particle and lowest pump fluence of ~ 4 uJ/cm2 result from almost completely impeded Auger recombination and low optical losses in the nanopillar cavity. These results represent a significant advance towards the development of future electrically pumped, colloidal nanocrystal lasers

Conference Presentation

Citation Download Citation

Anton V. Malko "Broadband, low-threshold optically pumped lasing based on CdS/CdSe/CdS spherical quantum wells in Si-based nanopillar optical cavities", Proc. SPIE PC12874, Nanoscale and Quantum Materials: From Synthesis and Laser Processing to Applications 2024, PC128740E (9 April 2024); https://doi.org/10.1117/12.3001082

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