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