Paper on "Plasmonic enhancement of photoacoustic-induced reflection changes" in Spotlight on Optics
The paper, “Plasmonic enhancement of photoacoustic-induced reflection changes”, has been chosen for inclusion in “Spotlight on Optics” by OSA. The research has been done in collaboration with ARCNL colleagues.
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
Guido de Haan, Vanessa Verrina, Aurèle J. L. Adam, Hao Zhang, and Paul C. M. Planken