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Thermo‐optic nonlinear response of silver nanoparticle colloids under a low power laser irradiation at 532 nm
Author(s) -
Karimzadeh Rouhollah,
Mansour Nastaran
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200945377
Subject(s) - materials science , z scan technique , refractive index , laser , irradiation , thermal conductivity , nanoparticle , colloid , photonics , nonlinear system , thermal , nonlinear optics , optics , continuous wave , silver nanoparticle , laser power scaling , lens (geology) , analytical chemistry (journal) , optoelectronics , nanotechnology , composite material , chemistry , thermodynamics , physics , chromatography , quantum mechanics , nuclear physics
Abstract The thermo‐optical properties of silver nanoparticles (AgNPs) in the water are investigated under irradiation of a continuous wave (CW) laser at 532 nm. Thermal conductivity of the AgNP colloids is estimated using the Maxwell model. The closed Z‐scan measurements reveal thermal contribution for the nonlinear refractive index of the AgNPs. The Z‐scan behavior is investigated based on nonlocal thermo‐optic process. It is shown that the aberrant thermal lens model is in excellent agreement with the Z‐scan experimental results of the sample. A fit allows extracting the values of nonlinear refractive index and thermo‐optic coefficient to be −1.0 × 10 −8 cm 2 /W and −0.99 × 10 −4 W/mK, respectively. Our results suggest that thermal nonlinear effects play an important role in the development of photonic application involving metal nanoparticle colloids and in the investigation of nonlocal nonlinear processes.