Output power enhancement of Rh6G dye laser by colloidal gold nanoparticles

Abstract

Improvement of the e ciency of a Rhodamine 6G dye laser by adding proper concentrations of gold colloidal nanoparticles into the dye solution has experimentally been investigated. Gold colloidal nanoparticles, due to their strong plasmonic peak in the visible region, are expected to have a considerable interaction with Rhodamine 6G dye molecules with broad emission spectrum in the visible range. It is shown that with addition of enough low concentrations (less than 0.4 M/l) of gold nanoparticles to the dye solution, both the output power and the e ciency of the dye laser increase. The best improvement of the laser e ciency reaches 15%. Two amplifying mechanisms exist for e ciency improvement by the nanoparticles, which are resonant energy transfer from the plasmonic nanoparticles to the dye molecules and the high near eld around the nanoparticles. The results indicate that in low concentrations of gold nanoparticles, the amplifying mechanisms dominate the dissipating mechanism of scattering of the pumped light by the nanoparticles. This leads to the e ciency improvement by addition of the nanoparticles.

Photo-Physical Characteristics of Janus Green B in Different Solvents and its Interaction Mechanism with Silver Nanoparticles

“…The second contributing factor to the observed increase in fluorescence intensity is the augmented number of excited active molecules due to enhanced local optical pump fields near the NP surface. This effect is expected to manifest in active media containing NPs with discernible plasmon resonance characteristics in the employed spectrum range [66,67]. Silver nanoparticles, exhibiting strong plasmon resonances in the visible spectrum, are noteworthy in this context.…”