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arXiv · 1312.4737

Low-power photothermal probing of single plasmonic nanostructures with nanomechanical string resonators

Silvan Schmid·Kaiyu Wu·Peter Emil Larsen·Tomas Rindzevicius·Anja Boisen
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Abstract

We demonstrate the direct photothermal probing and mapping of single plasmonic nanostructures via the temperature induced detuning of nanomechanical string resonators. Single Au nanoslits are illuminated with a low-power polarized focused laser beam (λ = 633 nm). Polarization dependent heat generation in gold nanoslits is then imaged with high sensitivity. A sensitivity of -4.1 ppm/nW with respect to the illuminated light (beam diameter 5.0pm0.8 μm) is determined for a single nanoslit (1 μm long and 53 nm wide), which equals to a total light absorption of 16%. This results in a heating of 0.5 K for an illuminance of 8 nW/μm2. Our results show that nanomechanical resonators are a unique and robust analysis tool for the low-power investigation of thermoplasmonic effects in plasmonic hot spots.

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Silvan Schmid, Kaiyu Wu, Peter Emil Larsen, Tomas Rindzevicius, Anja Boisen. 2013-12-17. Low-power photothermal probing of single plasmonic nanostructures with nanomechanical string resonators. https://doi.org/10.1021/nl4046679

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