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