Optical microprism cavities based on dislocation-free GaN
| Autor: | Marcus Bengths, Maryam Khalilian, Anders Gustafsson, Lars Samuelson, Åsa Haglund, Filip Hjort, Johan S. Gustavsson, Jörgen Bengtsson |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Diffraction Materials science Physics and Astronomy (miscellaneous) business.industry Nanowire 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology Laser 01 natural sciences law.invention Beam propagation method law Q factor 0103 physical sciences Optoelectronics Prism Dislocation 0210 nano-technology business |
| Zdroj: | Applied Physics Letters. 117:231107 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | Three-dimensional growth of nanostructures can be used to reduce the threading dislocation density that degrades III-nitride laser performance. Here, nanowire-based hexagonal GaN microprisms with flat top and bottom c-facets are embedded between two dielectric distributed Bragg reflectors to create dislocation-free vertical optical cavities. The cavities are electron beam pumped, and the quality (Q) factor is deduced from the cavity-filtered yellow luminescence. The Q factor is ∼500 for a 1000 nm wide prism cavity and only ∼60 for a 600 nm wide cavity, showing the strong decrease in Q factor when diffraction losses become dominant. Measured Q factors are in good agreement with those obtained from quasi-3D finite element frequency-domain method and 3D beam propagation method simulations. Simulations further predict that a prism cavity with a 1000 nm width will have a Q factor of around 2000 in the blue spectral regime, which would be the target regime for real devices. These results demonstrate the potential of GaN prisms as a scalable platform for realizing small footprint lasers with low threshold currents. |
| Databáze: | OpenAIRE |
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