Enhancement of photoacoustic emission from self-supported plasmonic multilayers
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Abstract
In this paper, we demonstrate remarkable photoacoustic emission from self-supported Au nanoparticle/dielectric/Ag mirror structures. They were prepared by depositing thin films on both sides of a 50-nm-thick silicon nitride membrane. The photoacoustic emission generated by the self-supported sample is more than 2 orders of magnitude larger than that of a similar structure supported by a Si wafer at a laser modulation frequency of 1 kHz. In this frequency region, the thermal diffusion length becomes much greater than the thickness of the multilayers, so that the photoacoustic amplitude is determined mainly by the thermal conductivity of the substrate. Therefore, the large enhancement of the photoacoustic emission can be understood in terms of the reduced thermal conductivity of the substrate.
Journal
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- Journal of Applied Physics
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Journal of Applied Physics 116 (2), 2014-07-14
AIP Publishing
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Details
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- CRID
- 1050001335799714688
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- NII Article ID
- 120005521606
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- NII Book ID
- AA00693547
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- ISSN
- 00218979
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- HANDLE
- 2433/192290
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles