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Tailoring the lasing modes in semiconductor nanowire cavities using intrinsic self-absorption
Xinfeng Liu1, Qing Zhang, Qihua Xiong
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.
Nano Letters
|February 12, 2013
Summary
Researchers developed a novel self-feedback mechanism for semiconductor nanowire (NW) lasers, enabling low-loss, tunable lasing. This intrinsic method enhances mode selectivity and is broadly applicable to NW laser development.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Semiconductor nanowire (NW) lasers are crucial for nanoscale optoelectronic devices.
- Achieving tunable output and high mode selectivity in NW lasers is challenging due to optical losses from extrinsic modification methods.
Purpose of the Study:
- To demonstrate a new, low-loss optical self-feedback mechanism for semiconductor NW lasers.
- To achieve high mode selectivity and wavelength tunability in NW lasers using intrinsic properties.
Main Methods:
- Utilized intrinsic self-absorption within the gain medium as an optical self-feedback mechanism.
- Investigated cadmium sulfide (CdS) nanowires of varying lengths (4–25 μm).
- Observed room-temperature lasing and measured mode selectivity and wavelength tunability.
Main Results:
- Achieved low-loss, room-temperature lasing in CdS NWs.
- Demonstrated high mode selectivity exceeding 30 nm.
- Showcased continuous wavelength tunability from 489 to 520 nm by varying NW length.
Conclusions:
- The intrinsic self-absorption mechanism offers a viable, low-loss route to tunable NW lasing.
- This approach overcomes limitations of extrinsic methods and is applicable to diverse semiconductor and plasmonic NW cavities.
