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