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