Optically-isolated III-nitride thin-film microcavities - a platform for next-generation surface-emitting laser diodes


Grant Data
Project Title
Optically-isolated III-nitride thin-film microcavities - a platform for next-generation surface-emitting laser diodes
Principal Investigator
Dr Choi, Hoi Wai   (Principal investigator)
Co-Investigator(s)
Dr Li Kwai Hei   (Co-Investigator)
Duration
36
Start Date
2015-09-01
Completion Date
2018-08-31
Amount
696029
Conference Title
Presentation Title
Keywords
Gallium Nitride, Microcavities, Laser
Discipline
Photonics
Panel
Engineering (E)
Sponsor
RGC General Research Fund (GRF)
HKU Project Code
17211415
Grant Type
General Research Fund (GRF)
Funding Year
2015/2016
Status
On-going
Objectives
1) To design and optimize the thin-film platform for Fabry-Perot and whispering-gallery mode optical micro-cavities: this include optimization of the geometries and dimensions of the cavities with the aid of simulations, optimization of the fabrication sequences and processes to ensure surface and facet smoothness; 2) To demonstrate high-quality Fabry-Perot and whispering gallery mode resonances and lasing from the thin-film microdisk structures: the project aims at demonstrating single and multi-mode whispering galley mode lasing with record-breaking high quality factors and ultra-low lasing thresholds; 3) To develop novel methods of assessing the confinement quality of a whispering-gallery optical cavity: this include the use of scanning near-field optical microscopy/ spectroscopy to detect whispering-gallery emission at the nanometer range for mapping of field pattern and mode order identification, as well as the multiple probe collection strategy to maximize the whispering-gallery signal in the far-field.