Figure 1
Nanostructures and absorption spectra of the samples.
(a) Illustration of the nanostructure of the sample. (b) Absorption spectra of the nanostructured silver films with normalized deposition time td/tc ranging from 0.13 to 1.28. The central peak of the LSPR (λSP) of the silver films shifts from 470 nm to 735 nm as td/tc increases from 0.13 to 0.94. (c) SEM image of the near-percolating silver film with normalized deposition time td/tc = 0.94. The average size of the silver nanoparticles is about 40 nm and the average gap distance between the silver nanoparticles is about 4 nm. (d) Absorption spectra of the silver film (td/tc = 0.94) and chlorophylls. The dashed lines indicate the laser excitation wavelength 735 nm and Chl-a emission wavelength ~675 nm.
