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26 September 2011 Spatiotemporal-photothermal and photoacoustic conversions with local plasmon resonators
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We have investigated the heat generation from gold nanoparticles resulting from their local plasma resonance. The selfassembly of Au nanoparticle arrays/dielectric layer/Ag mirror sandwiches, namely, local plasmon resonators, have been demonstrated by using a dynamic oblique deposition technique. Due to strong interference, the optical absorption of the local plasmon resonator chips we prepared is successfully controlled between 0.0% and 97% in the near-infrared region, by changing the thickness of the dielectric layer. We evaluated the heat generation from Au nanoparticles by measuring the temperature of water with which a cell prepared on a chip was filled under laser illumination. The temperature increase of the water is proportional to the optical absorption of the local plasmon resonator chips. This suggests that the photothermal conversion efficiency can be controlled by interference. In order to show the temporal controllability of heat generation, we also demonstrated photoacoustic measurements. The acoustic signal from the local plasmon resonator chips was much larger than the signal not only form high reflective Ag thin film but also from the graphite. These features indicate that the local plasmon resonators are suitable for nanoheaters which are capable of spatio-temporal control.
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Kyoko Namura, Motofumi Suzuki, Kaoru Nakajima, and Kenji Kimura "Spatiotemporal-photothermal and photoacoustic conversions with local plasmon resonators", Proc. SPIE 8104, Nanostructured Thin Films IV, 810406 (26 September 2011);

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