We study the ultrafast dynamics of surface electromagnetic waves photogenerated on aluminum film perforated with subwavelength holes array by means of transient photomodulation with 100 fs time resolution. We observed a pronounced blueshift of the resonant transmission band that reveals the important role of plasma attenuation in the dynamics and that is inconsistent with plasmon-polariton mechanism of extraordinary transmission. The transient photomodulation spectra were successfully modeled within the Boltzmann equation approach for the electron-phonon relaxation dynamics, involving non-equilibrium hot electrons and quasi-equilibrium phonons.
@article{arxiv.0808.3595,
title = {Ultrafast dynamics of surface electromagnetic waves in nanohole array on metallic film},
author = {A. S. Kirakosyan and M. Tong and T. V. Shahbazyan and Z. V. Vardeny},
journal= {arXiv preprint arXiv:0808.3595},
year = {2009}
}
Comments
8 pages, 6 figures. Invited paper in Special Issue "Optics on the Nanoscale II"