研究目的
To improve single-mode emission in vertical-cavity surface-emitting lasers (VCSELs) by introducing an antiresonant oxide island inside the resonant cavity using planar oxidation technique, and to investigate its impact on modal loss and mode profiles.
研究成果
The antiresonant oxide island significantly influences lateral mode profiles and photon lifetimes, enabling strong modal discrimination. By optimizing the island size, single-mode operation on the HE12 mode is achievable, with the HE12 mode exhibiting Gaussian-like profiles and low losses. This structure shows promise for high-power single-mode VCSELs.
研究不足
The study is based on simulations; experimental validation is not provided. Future work is needed to analyze threshold currents and radiated power of modes. The oxidation process may have practical constraints in fabrication.
1：Experimental Design and Method Selection:
The study uses optical modeling to simulate a VCSEL structure with an antiresonant oxide island. The design is based on a typical oxide-confined VCSEL for 850 nm wavelength, incorporating an ARROW structure via planar oxidation.
2：Sample Selection and Data Sources:
A simulated VCSEL structure is used, with parameters such as a 3/2 λ Al
3：3Ga7As resonant cavity, active region with three GaAs quantum wells, and DBRs made of Al2Ga8As/Al9Ga1As and SiO2/Si3NList of Experimental Equipment and Materials:
Materials include AlGaAs alloys (e.g., Al0.90Ga0.10As, Al0.98Ga0.02As), GaAs, SiO2, Si3N4; no specific equipment models are mentioned.
4：90Ga10As, Al98Ga02As), GaAs, SiO2, Si3N4; no specific equipment models are mentioned. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The oxide island radius is varied from 0 to 5 μm while keeping other dimensions constant. Simulations analyze resonant wavelengths, photon lifetimes, and light intensity profiles of lateral modes.
5：Data Analysis Methods:
Analysis involves plotting dependencies (e.g., wavelength vs. island radius) and comparing modal behaviors to assess discrimination.
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