Plasmonic Bragg Reflectors for Subwavelength Hole Arrays in a Metal Film

摘要

We present plasmonic Bragg reflectors for increasing the extraordinaryoptical transmission through periodic arrays of subwavelength apertures in ametal film. The increase in transmission arises by preventing loss at the edgesof the array. The plasmonic Bragg reflectors have periodicity of half the usualarray's periodicity. Nano-hole arrays flanked thus by reflectors exchibiteddouble the transmission as compared to the arrays without reflectors. Thesestructures may also be used to isolate devices in plasmonic integratedcircuits.