Surface-immobilized whispering gallery mode resonator spheres for optical sensing

We present a simple and fast solution for fixation of resonator spheres for an all-polymer whispering gallery mode sensor in the form of a spin coated UV curing adhesive. The fixation method does not need a precise adjustment of the distance between sphere and substrate. Using low-cost polymer components makes the sensor easy to manufacture. As a proof of principle of the sensing capabilities, we determine unknown optical wavelengths.