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Hybrid grating reflector with high reflectivity and broad bandwidth
Optics Express
|October 17, 2014
Summary
We introduce a hybrid grating (HG) reflector for vertical cavity lasers. This new design broadens the wavelength range and integrates gain for ultra-small lasers.
Area of Science:
- Optics and Photonics
- Semiconductor Devices
- Materials Science
Background:
- High-index-contrast gratings (HCGs) are used in optical devices.
- Existing grating reflectors have limitations in bandwidth and integration.
Purpose of the Study:
- To propose and investigate a novel hybrid grating (HG) reflector.
- To demonstrate its suitability for vertical cavity lasers with ultra-small modal volume.
Main Methods:
- Numerical investigation of hybrid grating properties.
- Analysis of HG structure comprising an un-patterned III-V layer and a Si grating.
Main Results:
- The hybrid grating exhibits large reflectivity over a broad wavelength range.
- The III-V layer introduces additional guided mode resonances, enhancing bandwidth compared to HCGs.
- The HG structure is suitable for realizing vertical cavity lasers with ultra-small modal volume.
Conclusions:
- The hybrid grating offers significant advantages in terms of reflectivity bandwidth.
- Integrating an active III-V layer enables laser fabrication with the gain region within the mirror itself.
