Table 2.

Radiative transitions (ω₀, ${\omega }_0^{\mathrm{\prime }}$) for dye-doped silica shell in the absence (SiO2 nanoparticles with a mean diameter of 60 nm as the core) and presence (gold nanostars with a size of about 60 nm as the core) of the plasmon field. The plasmon resonance frequency (ω_b) and linewidth (γ_b) is 1.648 eV and 498 meV for gold nanostars. The parameters (ω_b, ω₀, ${\omega }_0^{\mathrm{\prime }}$, γ₀) are obtained by fitting the experimentally measured absorption and PL spectra. The coupling strength λ is calculated based on eq. (5).

No plasmon field			Under the plasmon field		Observed energy shift (meV)	Calculated λ, meV	|γ−|	Ratio: 2γ−|/λ
dyes-SiO2	ω0, eV	γ0, meV	Au@dyes-SiO2	${\omega }_0^{\mathrm{\prime }},\mathrm{e}\mathrm{V}$	Δω0
Cy7	1.619	97	Au star-Cy7	1.576	−43	94	102	1.975
Cy7.5	1.546	123	Au star-Cy7.5	1.507	−39	96	103	1.823