Fig. 4: Blinking PL with stable dark field.
From: Intrinsic luminescence blinking from plasmonic nanojunctions
a Spectral time series from an individual nanojunction under sequential illuminations with 532 nm laser alone (PL), both 532 nm laser and white light (PL+DF, normalized by illumination spectrum) and white light alone (DF, normalized by illumination spectrum). The positions of maximum emission close to the L01 and S11 modes are shown as orange, blue, and purple traces for the PL, PL+DF, and DF regions, respectively. b, c Probability density functions (PDFs) for the relative L01 peak intensity (b) and wavelength shift (c) extracted from the PL (orange), DF (purple), and DF+PL (blue) regions in a. The DF+PL (blue) area in b are slightly offset away from the value of 1 to show it clearly. Experimental parameters: objective numerical aperture = 0.8; laser power density ~ 45 μW μm−2; white light is p-polarized; exposure time = 1 s, room temperature.
