Methods and devices for evanescently coupling light having different wavelengths to an open dielectric resonator

A method comprising:

• providing an evanescent field coupler having a first surface configured to evanescently couple light out from the evanescent field coupler and into an open dielectric resonator and couple light out from the open dielectric resonator and into the evanescent field coupler;
• selecting a first wavelength of light;
• and
• applying a thin film coating to at least a portion of the first surface of the evanescent field coupler, the thin film coating configured to enhance reflection of light of the first wavelength, wherein the thin film coating is further configured to decrease the coupling efficiency of light of the first wavelength and boost a loaded quality factor Q of light of the first wavelength propagating within the open dielectric resonator.

A system comprising:

• a light source configured to generate coherent light having a first wavelength and a second wavelength, the second wavelength substantially different than the first wavelength;
• an open dielectric resonator;
• and
• an evanescent field coupler having a first surface configured to evanescently couple light between the evanescent field coupler and the open dielectric resonator and a second surface through which the evanescent field coupler transmits and receives light to and from the light source,
• wherein the evanescent field coupler's first surface includes a thin film coating that is configured to decrease light coupling efficiency between the evanescent field coupler and the open dielectric coupler for light of the first wavelength relative to light coupling efficiency of the second wavelength, and the thin film coating further configured to boost loaded quality factor Q for light of the first wavelength within the open dielectric resonator.