The improved resonator structure utilizes radial Bragg reflectors in {HEAD ~ order} to confine {TAIL ~ the light} in a guiding defect 
The improved resonator structure utilizes radial Bragg reflectors in { HEAD ~ order } to confine { TAIL ~ the light } in a guiding defect
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH