2017/04/19 by András Szenes, Szenes, Andras, Balázs Bánhelyi +9
Engineering · Materials Science · #FOS: Physical sciences #Gold and Silver Nanoparticles Synthesis and Applications #Nonlinear Optical Materials Studies #Optics (physics.optics) #Plasmonic and Surface Plasmon Research
paper · pdf · doi:10.48550/arxiv.1704.05895
openalex publication_date 2017/04/19 · openalex created_date 2022/08/13 · openalex updated_date 2026/07/28
Configuration of three different concave silver core-shell nanoresonators was\nnumerically optimized to enhance the excitation and emission of embedded\nsilicon vacancy (SiV) diamond color centers simultaneously. According to the\ntradeoff between the radiative rate enhancement and quantum efficiency (QE)\nconditional optimization was performed to ensure ~2-3-4 and 5-fold apparent cQE\nenhancement of SiV color centers with ~10% intrinsic QE. The enhancement\nspectra, as well as the near-field and charge distribution were inspected to\nuncover the physics underlying behind the optical responses. The conditionally\noptimized coupled systems were qualified by the product of the radiative rate\nenhancements at the excitation and emission, which is nominated as Px factor.\nThe optimized spherical core-shell nanoresonator containing a centralized\nemitter is capable of enhancing considerably the emission via bonding dipolar\nresonance. The Px factor is 529-fold with 49.7% cQE at the emission.\nDecentralization of the emitter leads to appearance of higher order multipolar\nmodes, which is not advantageous caused by their nonradiative nature.\nTransversal and longitudinal dipolar resonances of the optimized ellipsoidal\ncore-shell resonator were tuned to the excitation and emission, respectively.\nThe simultaneous enhancements result in 6.2x105 Px factor with 50.6% cQE at\nthe emission. Rod-shaped concave core-shell nanoresonators exploit similarly\ntransversal and longitudinal dipolar resonances, moreover they enhance the\nfluorescence more significantly due to their antenna-like geometry. Px factor\nof 8.34x105 enhancement is achievable while the cQE is 50.3% at the emission.\nThe enhancement can result in 2.03x106-fold Px factor, when the criterion\nregarding the minimum QE is set to 20%.\n