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