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Efficient waveguide-coupling of metal-clad nanolaser cavities
Myung-Ki Kim1, Amit M Lakhani, Ming C Wu
1Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA.
Optics Express
|November 24, 2011
Summary
We demonstrate highly efficient coupling of semiconductor nanolasers to waveguides using metal-clad cavities. This breakthrough achieves 78% coupling efficiency, overcoming a major challenge in nanophotonics.
Area of Science:
- Photonics
- Nanotechnology
- Materials Science
Background:
- Semiconductor nanolasers offer potential for miniaturized optical devices.
- Efficiently coupling nanolaser cavities to waveguides remains a significant challenge.
Purpose of the Study:
- To achieve highly efficient coupling between semiconductor-based metal-clad nanolaser cavities and silicon-on-insulator waveguides.
- To overcome limitations in integrating nanolasers with photonic circuits.
Main Methods:
- Engineering the effective refractive index of the cavity mode.
- Optimizing the field distribution of the fundamental dielectric cavity mode.
- Utilizing a metal-clad nanolaser cavity design.
Main Results:
- Achieved a record coupling efficiency of 78%.
- Demonstrated coupling for a nanolaser with a small modal volume of 0.28 (λ/n)³.
- Maintained a high optical quality factor exceeding 600.
Conclusions:
- The proposed metal-clad nanolaser cavity design enables highly efficient light coupling to waveguides.
- This advancement is crucial for developing integrated nanophotonic circuits and devices.
- The method offers a viable solution for practical nanolaser integration.
