Enhancing Diamond Fluorescence via Optimized Nanorod Dimer Configurations
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Light extraction from silicon (SiV) and nitrogen (NV) vacancy diamond color centers coupled to plasmonic silver and gold nanorod dimers was numerically improved. Numerical optimization of the coupled dipolar emitter—plasmonic nanorod dimer configurations was realized to attain the highest possible fluorescence enhancement by simultaneously improving the color centers excitation and emission through antenna resonances. Conditional optimization was performed by setting a criterion regarding the minimum quantum efficiency of the coupled system (cQE) to minimize losses. By comparing restricted symmetric and allowed asymmetric dimers, the advantages of larger degrees of freedom achievable in asymmetric configurations was proven. The highest 2.59 × 108 fluorescence enhancement was achieved with 46.08% cQE via NV color center coupled to an asymmetric silver dimer. This is 3.17-times larger than the 8.19 × 107 enhancement in corresponding symmetric silver dimer configuration, which has larger 68.52% cQE. Among coupled SiV color centers the highest 1.04 × 108 fluorescence enhancement was achieved via asymmetric silver dimer with 37.83% cQE. This is 1.06-times larger than the 9.83 × 107 enhancement in corresponding symmetric silver dimer configuration, which has larger 57.46% cQE. Among gold nanorod coupled configurations the highest fluorescence enhancement of 4.75 × 104 was shown for SiV color center coupled to an asymmetric dimer with 21.8% cQE. The attained enhancement is 8.48- (92.42-) times larger than the 5.6 × 103 (5.14 × 102) fluorescence enhancement achievable via symmetric (asymmetric) gold nanorod dimer coupled to SiV (NV) color center, which is accompanied by 16.01% (7.66%) cQE.
KeywordsLocalized surface plasmon resonance Nanorod dimer Diamond vacancy center Fluorescence enhancement Numerical configuration optimization
Mária Csete acknowledges that the project was supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences. The authors would like to thank Dávid Vass and Géza Veszprémi for figure preparation.
The research was supported by National Research, Development and Innovation Office-NKFIH through project “Optimized nanoplasmonics” K116362.
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