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