Continuous-wave operation of an electrically pumped single microribbon based Fabry-Perot microlaser

Area of Science:

• Optoelectronics
• Materials Science
• Solid State Physics

Background:

• Fabry-Perot (FP) mode microlasers are crucial for on-chip coherent light sources due to directional emission.
• Heterojunction LEDs offer potential for novel light emission mechanisms.

Purpose of the Study:

• To fabricate and characterize a ZnO:Ga microribbon and p-GaAs heterojunction LED.
• To demonstrate exciton-photon coupling and polariton lasing in the blue-violet spectrum.
• To investigate the potential for on-chip coherent light sources.

Main Methods:

• Fabrication of a Ga-doped ZnO (ZnO:Ga) microribbon on a p-GaAs template.
• Electrical injection under continuous-wave operation.
• Analysis of electroluminescence characteristics, including polariton lasing and exciton-polariton coupling strengths.

Main Results:

• Demonstrated strong coupling of exciton-photon and polariton lasing in the blue-violet spectrum.
• Achieved FP-mode lasing action in a single ZnO:Ga microribbon.
• Quantified exciton-polariton coupling strength via Rabi splitting energy (500 meV).
• Observed laser illuminating peaks above a specific current threshold, dominating waveguide EL spectra.

Conclusions:

• Experimental results provide evidence for lasing originating from polariton resonances.
• Single microribbon FP-mode microresonators offer compact, low-threshold on-chip coherent light sources.
• The device is a promising candidate for integrated nanophotonic and optoelectronic circuitry.