Peculiarities of lasing in solutions of Rhodamine 6G with nanoparticles free of plasmon resonance
V.A. Donchenko1, Al.A. Zemlyanov1, M.M. Zinoviev2, N.S. Panamarev2, A.V. Trifonova2, V.A. Kharenkov1
1Siberian Physical-Technical Institute of the Tomsk State University, Tomsk, Russia, 634050, Tomsk, pl. Novo-Sobornaya, 1, Russia
2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia
Keywords: активная среда, наночастицы, коллоидные растворы, безрезонаторная генерация, плазмонный резонанс, active medium, nanoparticles, colloidal solutions, lasing, plasmon resonance
Abstract
The threshold characteristics of lasing in a layer of colloidal solution of dye Rhodamine 6G with plasmon-resonance Au nanoparticles and non-plasmon-resonance Pt nanoparticles excited by a wavelength of 532 nm are experimentally investigated. The spectral dependence of the scattering and absorption cross sections of nanoparticles of gold and platinum are calculated within the Mie theory. It is established experimentally that the addition of nanoparticles to the active medium reduces the lasing thresholds by two orders of magnitude. It is shown that the lasing threshold value is 1.5-2 times lower when adding gold nanoparticles than when adding platinum nanoparticles of the same concentration.
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