Line Plot from Scientific Research

Coupling parameter ( K ), defined as the ratio of the resonator-waveguide coupling rate ( ext ) to the resonator intrinsic loss rate ( int ), for the idler, pump, and signal modes (blue, green, and orange) as a function of resonator-waveguide gap. The top inset shows an optical micrograph of one device, where the scale bar is 5 m, along with the refractive index (thin black) profile along a cross-section through the ring and waveguide (wg), and the radial component of the evanescent tail of the idler and pump modes (black and green curves).

DOI