In one embodiment the light is confined from both the internal and the external sides of the device forming a guiding channel or just by {HEAD ~ the external side} forming {TAIL ~ a disk resonator} 
In one embodiment the light is confined from both the internal and the external sides of the device forming a guiding channel or just by { HEAD ~ the external side } forming { TAIL ~ a disk resonator }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL