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Single-mode nanolasers based on FP-WGM hybrid cavity coupling
Salman Ullah1,2, Minghua Zhuge3, Liang Zhang4
1State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
Nanotechnology
|February 13, 2024
Summary
Researchers developed a novel single-mode nanolaser using coupled cadmium sulfide (CdS) nanowires (NWs). This hybrid nanocavity design achieves low-threshold lasing, paving the way for advanced optoelectronic devices.
Area of Science:
- Optoelectronics and Nanophotonics
- Semiconductor Nanowire Lasers
Background:
- Semiconductor nanowire (NW) lasers are crucial for optoelectronics, nanophononics, optical communication, signal processing, and displays.
- Achieving single-mode lasing in NWs is essential for high-performance photonic devices.
Purpose of the Study:
- To propose and demonstrate a novel approach for realizing a single-mode nanolaser.
- To investigate the potential of a hybrid nanocavity formed by cross-contacted CdS NWs for mode control.
Main Methods:
- Fabrication of a hybrid nanocavity using two cross-contacted CdS nanowires (x-NW and y-NW).
- The x-NW supports Fabry-Perot (FP) oscillations, while the y-NW provides a whispering gallery mode (WGM) nanocavity.
- Experimental characterization of lasing emission, threshold, and spectral properties.
Main Results:
- Successful realization of single-mode lasing emission centered at 517 nm.
- Achieved a narrow spectral width (Full Width at Half Maximum) of 0.08 nm.
- Observed a low lasing threshold of approximately 50 kW cm⁻².
Conclusions:
- The proposed FP-WGM hybrid nanocavity design effectively enables single-mode operation and mode selection in CdS NW lasers.
- This strategy offers a general approach for regulating lasing modes and achieving single-mode realization in nanolasers.
- The developed single-mode, low-threshold lasing technique in coupled NWs opens new possibilities for visible-range photonic devices.
