Figure 4:

The impact of illuminating at plasmon resonance. (A) Total near-field emission of NV centers in NV^⊥AgNP (∠ → ⊥) and NV^‖AgNP (∠ → ‖) setups in air illuminated at the input wavelength 532 nm (λ ₅₃₂) and at the plasmon resonance wavelength of the adjacent AgNP (λ _pl). The AgNP radius r _m = 7 nm and the NV-AgNP center separation R = 12 nm. The submerging medium is air. (B) The right y-axis shows the absolute polarizability |α| of the r _m = 7 nm AgNP in air. The blue diamond and circle depict the values of the input laser energies when illuminated at λ ₅₃₂ and λ _pl, respectively. The estimated decay rates for generic emitters oriented radially (⊥) and tangentially (‖) to the surface of the same AgNP, normalized by the respective free-space decay rates γ ^f(ω), are shown on the left y-axis. Red and pink circles depict the values at NV emission peaks, for NV^⊥AgNP and NV^‖AgNP orientations, respectively.