investigation of nanosize waveguide and nanofiber coupler
Long interaction region coupler and racetrack resonator constructed by nanosize waveguide and nanosize optical fiber are investigated. Several components are investigated separately by using theoretical methods or simulation methods. For planar waveguide and coupler, analytical solution of parallel waveguides pair is investigated, by solving Maxwell equation, instead of weakly guiding approximation. The input field is distributed onto the complete set of solutions of the coupler super-modes, which propagate separately inside coupler. At the output port, the superposition of each mode is directly related with the coupler output. The field distribution at the output of parallel waveguides pair is calculated theoretically. After verified the method, for nanofiber, the propagation constant is got by numerical simulation, and then the nanofiber coupler could be investigated as the same way. Based on the analysis of coupler, the racetrack resonator could be investigated.
nanofiber racetrack resonator waveguide coupler