Hexagonal micropillar cavities: multimode resonances and open-loop resonance linewidth broadening

Ning Ma, Frankie K. L. Tung, Shing Fai Lui, Andrew W. Poon, Marek Osinski, Hiroshi Amano, Peter Blood
2003 Physics and Simulation of Optoelectronic Devices XI  
We report our proof-of-principle experiment and modeling of hexagonal micro-pillar (µ-pillar) cavities. A commercial hexagonal silica fiber (125µm plane-to-plane) was side-coupled perpendicularly with a Gaussian beam, thus the fiber acted as a µ-pillar cavity. We observed multimode resonances with typical Q ≈ 2,500 in the tangential directions that are ≈ 120° to the input-coupling cavity sidewall. The observed free spectral range (FSR) ≈ 4.5 nm is consistent with a six-bounce cavity round-trip
more » ... ength. By using wavefront-matching concept, the observed multimode resonances can be attributed to open-loop trajectories. The multiple wavefront-matched open-loop trajectories of the same ray incident angle can result in resonance linewidth broadening. We employed a k-space representation to calculate the hexagonal cavity normal mode locations.
doi:10.1117/12.474382 fatcat:faa4hbavcbcovmkpfz67oqypym