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Photoacoustic emission from Au nanoparticles arrayed on thermal insulation layer
Kyoko Namura1, Motofumi Suzuki, Kaoru Nakajima
1Department of Micro Engineering, Kyoto University, Kyoto 606-8501, Japan. namura.kyoko.57r@st.kyoto-u.ac.jp
Optics Express
|April 11, 2013
Summary
Gold nanoparticles on porous silica layers generate strong photoacoustic signals. This enhancement, due to reduced heat loss, offers potential for precise temperature control in plasmonic devices.
Area of Science:
- Plasmonics
- Nanotechnology
- Acoustics
Background:
- Photoacoustic emission is crucial for various sensing applications.
- Gold nanoparticles exhibit unique plasmonic properties.
- Controlling heat transfer is key to enhancing photoacoustic signals.
Purpose of the Study:
- To investigate efficient photoacoustic emission from gold nanoparticles on porous silica.
- To understand the role of a porous silica layer in photoacoustic signal generation.
- To explore the potential of dynamic oblique deposition (DOD) for creating local plasmon resonators.
Main Methods:
- Fabrication of gold nanoparticle arrays/porous SiO(2)/SiO(2)/Ag mirror structures using dynamic oblique deposition (DOD).
- Experimental photoacoustic measurements on structures with varying optical absorption.
- Theoretical analysis using a one-dimensional heat transfer model.
Main Results:
- The sample with high optical absorption (0.95) showed significantly stronger photoacoustic emission compared to graphite and samples without the porous layer.
- The porous SiO(2) layer was identified as a key factor in enhancing photoacoustic emission.
- Low thermal conductivity of the porous layer was found to reduce heat escape, boosting the photoacoustic signal.
Conclusions:
- Gold nanoparticle arrays on porous silica layers are efficient photoacoustic emitters.
- The porous silica layer enhances photoacoustic emission by limiting heat dissipation.
- DOD allows control over thermal properties and heat generation, making these resonators suitable for spatio-temporal temperature modulation.
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