Enhanced downconversion of UV light by resonant scattering of aluminum nanoparticles.
Metallic nanoparticles are known to enhance nonlinear optical processes due to a local enhancement of the optical field. This strategy has been proposed to enhance downconversion in thin film solar cells, but has various disadvantages, among which is the fact that the enhancement occurs only in a tiny volume close to the particles. We report on a very different physical mechanism that can lead to significant downconversion enhancement, namely, that of resonant light scattering, and which is a large volume effect. We show that only a tiny amount of resonantly scattering metallic (aluminum) nanoparticles is enough to create a significant enhancement of the fluorescence of dye molecules in the visible wavelength range. The strategy can be applied in general to increase the emission of UV-absorbing constituents, and is of particular use for solar energy.
European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, Sesto Fiorentino, Italy.
Rajeshkumar
R
Mupparapu
Kevin
K
Vynck
Iacopo
I
Malfanti
Silvia
S
Vignolini
Matteo
M
Burresi
Petra
P
Scudo
Roberto
R
Fusco
Diederik S
DS
Wiersma
D000535:Aluminum / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D012542:Scattering, Radiation; D013050:Spectrometry, Fluorescence; D014466:Ultraviolet Rays
D000535:Aluminum