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Tuning the wavelength of amplified spontaneous emission coupled to localized surface plasmon

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4 Author(s)
Murai, S. ; Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan ; Tokuda, Y. ; Fujita, K. ; Tanaka, K.

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Amplified spontaneous emissions (ASEs) with a tuned wavelength have been observed in a thin film composite made by spin-coating a dye-doped polymer layer (thickness ∼80 nm) on Ag nanoparticles deposited on a SiO2 substrate. The samples having a varied wavelength of the localized surface plasmon resonance (LSPR) are excited with second harmonic pulses from a Nd3+ doped yttrium aluminum garnet laser. When the pump energy exceeds a threshold, a spectrally narrow peak appears on a broad emission from dye molecules with a nonlinear increase in emission intensity, indicating an onset of ASE. It is found that the peak wavelength of ASE shifts with the change of the wavelength of LSPR.

Published in:

Applied Physics Letters  (Volume:101 ,  Issue: 3 )

Date of Publication:

Jul 2012

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