High-<i>Q</i> plasmonic resonances from a transfer-printed diamond ring on a silver surface

Abstract Optically addressable point defects in diamond are promising physical platforms in quantum technologies. In particular, defects embedded in plasmonic devices can interact strongly with photons and provide a robust approach to engineering spin-photon interfaces. However, diamond-based plasmonic devices have low quality factors of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>Q</mml:mi> <mml:mo>≲</mml:mo> <mml:mn>1</mml:mn> <mml:mn>0</mml:mn> </mml:math> , constrained by fabrication difficulties. This study demonstrates the high- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>Q</mml:mi> </mml:math> plasmonic resonance of optical emissions from nitrogen-vacancy centers in diamond ring structures onto a silver surface, and experimentally shows that <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>Q</mml:mi> <mml:mo>≈</mml:mo> <mml:mn>179</mml:mn> </mml:math> . The proposed device can be easily fabricated using the transfer printing technique. These results address the lack of high- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>Q</mml:mi> </mml:math> plasmonic cavities in diamond-based technologies.