Scattering induced optical limiting in Si/SiO2 nanostructure dispersions

We present evidence for scattering induced optical limiting in a suspension of Si/SiO2 nanostructures in an isopropanol solution. The structures were studied by open and closed aperture z-scan with 6ns Gaussian pulses at 532nm from a frequency doubled, Q switched Nd:YAG laser. The linear absorption...

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Bibliographic Details
Published in:Optics communications 2007-08, Vol.276 (2), p.305-309
Main Authors: King, Sharon M., Chaure, Shweta, Doyle, James, Colli, Alan, Ferrari, Andrea C., Blau, Werner J.
Format: Article
Language:English
Subjects:
Beam trapping, self-focusing and defocusing
self-phase modulation
Diffraction and scattering
Dynamics of nonlinear optical systems
optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Glasses, quartz
Nonlinear optics
Optical materials
Optics
Physics
Wave optics
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Summary:We present evidence for scattering induced optical limiting in a suspension of Si/SiO2 nanostructures in an isopropanol solution. The structures were studied by open and closed aperture z-scan with 6ns Gaussian pulses at 532nm from a frequency doubled, Q switched Nd:YAG laser. The linear absorption of the nanostructures displayed evidence of quantum confinement. An intensity dependent scattering study illustrated the contribution to optical limiting from scattering mechanisms. We propose that optical limiting is occurring at scattering centres, most likely plasmas, which are formed through ionisation of the SiO2 outer shells.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2007.04.028