Plasmonic enhancement of photoacoustic strain-waves on gold gratings

In this paper, we report on the time-dependent strain-wave-induced changes in the reflection and diffraction of a gold plasmonic grating. We demonstrate efficient excitation of strain waves using enhanced absorption at and around the surface plasmon polariton resonance. In addition, we observe that...

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Bibliographic Details
Published in:AIP advances 2022-02, Vol.12 (2), p.025227-025227-8
Main Authors: de Haan, G., Abram, E., van den Hooven, T. J., Planken, P. C. M.
Format: Article
Language:English
Subjects:
Fluence
Gold
Plasmonics
Polaritons
Reflection
Wave diffraction
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Summary:In this paper, we report on the time-dependent strain-wave-induced changes in the reflection and diffraction of a gold plasmonic grating. We demonstrate efficient excitation of strain waves using enhanced absorption at and around the surface plasmon polariton resonance. In addition, we observe that the strain-wave-induced changes in the reflection and diffraction of the grating show an approximately quadratic dependence on pump fluence when probed at a wavelength of 400 nm. We tentatively attribute this non-linear behavior to strain-induced nonlinear changes of the interband transition energy. Using a model that calculates the permittivity of the gold taking into account the d to s/p interband transition, we deduce that the interband transition energy would have to change by about 0.013 eV to account for the measured changes in reflection.
ISSN:2158-3226
2158-3226
DOI:10.1063/5.0070630