Plasmonic enhancement of photoacoustic strain-waves on gold gratings | Zendy

G. de Haan | Zendy; Ester Abram | Zendy; Thomas J. van den Hooven | Zendy; P. C. M. Planken | Zendy

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Plasmonic enhancement of photoacoustic strain-waves on gold gratings

Author(s) -

G. de Haan,

Ester Abram,

Thomas J. van den Hooven,

P. C. M. Planken

Publication year - 2022

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/5.0070630

Subject(s) - plasmon , grating , materials science , diffraction , reflection (computer programming) , permittivity , optics , polariton , diffraction grating , excitation , surface plasmon resonance , wavelength , absorption (acoustics) , optoelectronics , dielectric , physics , nanoparticle , nanotechnology , quantum mechanics , computer science , programming language

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.

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