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Published on: February 25, 2017
Lasing in hybrid metal-Bragg nanocavities
Jong-Bum You1, Kyungmook Kwon, Wook-Jae Lee
1Department of Electrical Engineering, KAIST, Daejeon, South Korea.
Optics Letters
|August 14, 2013
Summary
Researchers achieved room-temperature lasing in a subwavelength InGaAsP pillar using circular Bragg reflectors. This breakthrough enables efficient optical feedback for low-threshold lasers, enhancing performance through cavity effects.
Area of Science:
- Optoelectronics
- Nanophotonics
- Semiconductor Lasers
Background:
- Subwavelength-scale lasers are crucial for miniaturized optical devices.
- Achieving efficient lasing at room temperature remains a challenge.
Purpose of the Study:
- To demonstrate room-temperature lasing in an optically pumped subwavelength InGaAsP pillar.
- To investigate the role of circular Bragg reflectors and dielectric spacers in laser performance.
Main Methods:
- Fabrication of a subwavelength-scale cylindrical InGaAsP pillar.
- Integration with circular Bragg reflectors on a metal substrate and a dielectric spacer layer.
- Optical pumping for laser excitation.
Main Results:
- Room-temperature lasing achieved from the fundamental TE011 mode.
- Wide in-plane photonic bandgaps and vertical antiresonances provided sufficient optical feedback.
- Three dielectric Bragg pairs enabled low-threshold lasing.
- Cavity-enhanced Purcell effects led to large spontaneous emission coupling.
- Effective suppression of nonlasing modes was observed.
Conclusions:
- The developed structure enables efficient room-temperature lasing in subwavelength devices.
- The design utilizing Bragg reflectors and dielectric spacers is effective for optical feedback.
- Cavity effects significantly enhance spontaneous emission coupling and laser performance.
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