In this paper, we report on surface-plasmon-resonance enhancement of the time-dependent reflection changes caused by laser-induced acoustic waves. We measure an enhancement of the reflection changes induced by several acoustical modes, such as longitudinal, quasi-normal, and surface acoustic waves, by a factor of 10–20. We show that the reflection changes induced by the longitudinal and quasi-normal modes are enhanced in the wings of the surface plasmon polariton resonance. The surface acoustic wave-induced reflection changes are enhanced on the peak of this resonance. We attribute the enhanced reflection changes to the longitudinal wave and the quasi-normal mode to a shift in the surface plasmon polariton resonance via acoustically induced electron density changes and via grating geometry changes.

Plasmonic enhancement of photoacoustic-induced reflection changes / de Haan, Guido; Verrina, Vanessa; Adam, Aurèle J. L.; Zhang, Hao; Planken, and Paul C. M.. - In: APPLIED OPTICS. - ISSN 2155-3165. - 60:24(2021), pp. 7304-7313. [10.1364/AO.432659]

Plasmonic enhancement of photoacoustic-induced reflection changes

Vanessa Verrina
Co-primo
;
2021

Abstract

In this paper, we report on surface-plasmon-resonance enhancement of the time-dependent reflection changes caused by laser-induced acoustic waves. We measure an enhancement of the reflection changes induced by several acoustical modes, such as longitudinal, quasi-normal, and surface acoustic waves, by a factor of 10–20. We show that the reflection changes induced by the longitudinal and quasi-normal modes are enhanced in the wings of the surface plasmon polariton resonance. The surface acoustic wave-induced reflection changes are enhanced on the peak of this resonance. We attribute the enhanced reflection changes to the longitudinal wave and the quasi-normal mode to a shift in the surface plasmon polariton resonance via acoustically induced electron density changes and via grating geometry changes.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1568611
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