Gold nanoparticles deposited on fluorine-doped tin oxide substrates as materials for laser operated optoelectronic devices
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Abstract
We have discovered occurrence of strong narrow spectral lines in gold nanoparticles deposited on fluorine-doped tin oxide substrates at wavelengths 410, 440 and 550 nm under influence of 808 nm wavelength laser illumination with power about 200 mW. These lines appear just after the 1 s of illumination and are almost unchanged during all the remaining time of illumination. Such lines are absent for the other content of gold nanoparticles-modified substrates. So a principle role here is played by the inter-particle distances. The relaxation process is continued during 8–10 h and the samples return to their initial states. The occurrence of the such narrow spectral lines may be a consequence of the two-photon absorption related with the corresponding electron–phonon interactions due to specific interactions between the plasmons and the phonon subsystem and the free carriers.
Notes
Acknowledgments
This work was partially supported by Polish National Science Centre (Project No. 2011/01/B/ST7/06194) and by King Saud University, and by Grant No. 215525/m/10 from King Abdulaziz City for Science and Technology, Saudi Arabia.
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