Critical optical coupling between a GaAs disk and a nanowaveguide suspended on the chip
arXiv:1108.0680 · doi:10.1063/1.3651493
Abstract
We report on an integrated GaAs disk/waveguide system. A millimeter-long waveguide is suspended and tapered on the chip over a length of 25 μm to evanescently couple to high Q optical whispering gallery modes of a GaAs disk. The critical coupling regime is obtained both by varying the disk/guide gap distance and the width of the suspended nanoscale taper. The experimental results are in good agreement with predictions from the coupled mode theory.
14 pages, 4 figures