Low-power photothermal probing of single plasmonic nanostructures with nanomechanical string resonators.
Nano Lett
; 14(5): 2318-21, 2014 May 14.
Article
em En
| MEDLINE
| ID: mdl-24697597
We demonstrate the direct photothermal probing and mapping of single plasmonic nanostructures via the temperature-induced detuning of nanomechanical string resonators. Single Au nanoslits and nanorods are illuminated with a partially polarized focused laser beam (λ = 633 nm) with irradiances in the range of 0.26-38 µW/µm(2). Photothermal heating maps with a resolution of â¼375 nm are obtained by scanning the laser over the nanostructures. Based on the string sensitivities, absorption efficiencies of 2.3 ± 0.3 and 1.1 ± 0.7 are extracted for a single nanoslit (53 nm × 1 µm) and nanorod (75 nm × 185 nm). 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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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2014
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Article