Saturable absorption and reverse saturable absorption in platinum nanoparticles

The optical nonlinear absorption of the aqueous solution of platinum nanospheres protected by poly (N-vinyl-2-pyrrolidone) was investigated using open aperture Z-scan method with nanosecond pulse laser at the wavelength of 532nm. A shift from saturable absorption to reverse saturable absorption was...

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Bibliographic Details
Published in:Optics communications 2005-07, Vol.251 (4-6), p.429-433
Main Authors: Gao, Yachen, Zhang, Xueru, Li, Yuliang, Liu, Hanfan, Wang, Yuxiao, Chang, Qing, Jiao, Weiyan, Song, Yinglin
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Laser materials
Nanoparticle
Nonlinear absorption
Nonlinear optics
Optical materials
Optics
Physics
Reverse saturable absorption
Saturable absorption
Ultrafast processes
optical pulse generation and pulse compression
Z-scan
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Summary:The optical nonlinear absorption of the aqueous solution of platinum nanospheres protected by poly (N-vinyl-2-pyrrolidone) was investigated using open aperture Z-scan method with nanosecond pulse laser at the wavelength of 532nm. A shift from saturable absorption to reverse saturable absorption was observed at higher input pump intensities. The transition process was analyzed using a phenomenological model based on nonlinear absorption coefficient and saturation intensity.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2005.03.003