Enhanced collection efficiency of quantum emitter mediated by extra ordinary optical transmission in a plasmonic cavity

Manipulation of light-matter interaction has played a key role in developing modern quantum optical technologies. We have designed a plasmonic cavity by placing a gold film over a dielectric layer of PMMA (spacer layer) placed on the distributed Bragg reflector with a high reflection band between 550 nm and 750 nm using computational models. We then introduced periodic holes of subwavelength dimension in the gold film and a quantum emitter (QE) is placed inside the spacer layer. When QE interacts with the periodic array of nano-holes, it shows an enhanced light transmission through them due to the phenomenon of extraordinary optical transmission (EOT), which is attributed to surface plasmon polariton excitations in the metallic structures. When the QE emission is coupled with these modes, EOT will help its emission to propagate into the far-field domain. We find an average Purcell enhancement of 3 times with 50% collection efficiency without using an antenna. The results have the potential to develop better single-photon coupling interfaces, quantum communication systems, and other quantum technologies.