Tuning photoacoustics with nanotransducers via Thermal Boundary Resistance and Laser Pulse Duration
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916288651067392 |
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| author | Diego, Michele Gandolfi, Marco Giordano, Stefano Vialla, Fabien Crut, Aurélien Vallée, Fabrice Maioli, Paolo Del Fatti, Natalia Banfi, Francesco |
| author_facet | Diego, Michele Gandolfi, Marco Giordano, Stefano Vialla, Fabien Crut, Aurélien Vallée, Fabrice Maioli, Paolo Del Fatti, Natalia Banfi, Francesco |
| contents | The photoacoustic effect in liquids, generated by metal nanoparticles excited with short laser pulses, offers high contrast imaging and promising medical treatment techniques. Understanding the role of the thermal boundary resistance (TBR) and the laser pulse duration in the generation mechanism of acoustic waves is essential to implement efficient photoacoustic nanotransducers. This work theoretically investigates, for the paradigmatic case of water-immersed gold nanocylinders, the role of the TBR and of laser pulse duration in the competition between the launching mechanisms: the thermophone and the mechanophone. In the thermophone, the nanoparticle acts as a nanoheater and the wave is launched by water thermal expansion. In the mechanophone, the nanoparticle directly acts as a nanopiston. Specifically, for a gold-water interface, the thermophone prevails under ns light pulse irradiation, while the mechanophone dominates shortening the pulse to the 10 ps regime. For a graphene-functionalized gold-water interface, instead, the mechanophone dominates over the entire range of explored laser pulse durations. Results point to high-TBR, liquid-immersed nanoparticles as potentially efficient photoacoustic nanogenerators, with the advantage of keeping the liquid environment temperature unaltered. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_10480 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tuning photoacoustics with nanotransducers via Thermal Boundary Resistance and Laser Pulse Duration Diego, Michele Gandolfi, Marco Giordano, Stefano Vialla, Fabien Crut, Aurélien Vallée, Fabrice Maioli, Paolo Del Fatti, Natalia Banfi, Francesco Mesoscale and Nanoscale Physics The photoacoustic effect in liquids, generated by metal nanoparticles excited with short laser pulses, offers high contrast imaging and promising medical treatment techniques. Understanding the role of the thermal boundary resistance (TBR) and the laser pulse duration in the generation mechanism of acoustic waves is essential to implement efficient photoacoustic nanotransducers. This work theoretically investigates, for the paradigmatic case of water-immersed gold nanocylinders, the role of the TBR and of laser pulse duration in the competition between the launching mechanisms: the thermophone and the mechanophone. In the thermophone, the nanoparticle acts as a nanoheater and the wave is launched by water thermal expansion. In the mechanophone, the nanoparticle directly acts as a nanopiston. Specifically, for a gold-water interface, the thermophone prevails under ns light pulse irradiation, while the mechanophone dominates shortening the pulse to the 10 ps regime. For a graphene-functionalized gold-water interface, instead, the mechanophone dominates over the entire range of explored laser pulse durations. Results point to high-TBR, liquid-immersed nanoparticles as potentially efficient photoacoustic nanogenerators, with the advantage of keeping the liquid environment temperature unaltered. |
| title | Tuning photoacoustics with nanotransducers via Thermal Boundary Resistance and Laser Pulse Duration |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2406.10480 |