High-Q coupled resonances on a PhC waveguide using a tapered nanofiber with high coupling efficiency.
/ Authors
/ Abstract
We experimentally demonstrate high-Q cavity formation at an arbitrary position on a silicon photonic crystal waveguide by bringing a tapered nanofiber into contact with the surface of the slab. An ultrahigh Q of 5.1 × 10(5) is obtained with a coupling efficiency of 39%, whose resonant wavelength can be finely tuned by 27 pm by adjusting the contact length of the nanofiber. We also demonstrate an extremely high coupling efficiency of 99.6% with a loaded Q of 6.1 × 10(3). We show that we can obtain a coupled resonances, which has the potential to be used for slow light generation.
Journal: Optics express
DOI: 10.1364/OE.23.016256