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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 8689–8700

Photoacoustic emission from Au nanoparticles arrayed on thermal insulation layer

Kyoko Namura, Motofumi Suzuki, Kaoru Nakajima, and Kenji Kimura  »View Author Affiliations

Optics Express, Vol. 21, Issue 7, pp. 8689-8700 (2013)

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Efficient photoacoustic emission from Au nanoparticles on a porous SiO2 layer was investigated experimentally and theoretically. The Au nanoparticle arrays/porous SiO2/SiO2/Ag mirror sandwiches, namely, local plasmon resonators, were prepared by dynamic oblique deposition (DOD). Photoacoustic measurements were performed on the local plasmon resonators, whose optical absorption was varied from 0.03 (3%) to 0.95 by varying the thickness of the dielectric SiO2 layer. The sample with high absorption (0.95) emitted a sound that was eight times stronger than that emitted by graphite (0.94) and three times stronger than that emitted by the sample without the porous SiO2 layer (0.93). The contribution of the porous SiO2 layer to the efficient photoacoustic emission was analyzed by means of a numerical method based on a one-dimensional heat transfer model. The result suggested that the low thermal conductivity of the underlying porous layer reduces the amount of heat escaping from the substrate and contributes to the efficient photoacoustic emission from Au nanoparticle arrays. Because both the thermal conductivity and the spatial distribution of the heat generation can be controlled by DOD, the local plasmon resonators produced by DOD are suitable for the spatio-temporal modulation of the local temperature.

© 2013 OSA

OCIS Codes
(310.4165) Thin films : Multilayer design
(110.5125) Imaging systems : Photoacoustics

ToC Category:
Thin Films

Original Manuscript: January 17, 2013
Revised Manuscript: March 1, 2013
Manuscript Accepted: March 4, 2013
Published: April 2, 2013

Kyoko Namura, Motofumi Suzuki, Kaoru Nakajima, and Kenji Kimura, "Photoacoustic emission from Au nanoparticles arrayed on thermal insulation layer," Opt. Express 21, 8689-8700 (2013)

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