Fig. 4: Detuning- and fluence-dependent photoluminescence (PL).
From: Non-thermal emission in gap-mode plasmon photoluminescence
a Power-law exponent (PLE) as a function of emitted photon energy extracted from the nonlinear PL (NPL) at different resonance detuning for \({d}_{{{{{{{{{\rm{SiO}}}}}}}}}_{{{{{{{{\rm{2}}}}}}}}}}=2\) nm, as labeled. b Fitting parameters used in PLEs in (a). c Extracted ratios of the relative contributions of thermal to non-thermal (thermal:non-thermal) electronic distributions from the emitted light as a function of detuning. d PLE as a function of emitted photon energy extracted from the NPL, at different laser excitation power, as labeled. e Fitting parameters used in PLEs in (d). f Extracted ratios of the relative contributions of thermal to non-thermal (thermal:non-thermal) electronic distributions from the emitted light as a function of fluence.
