Mid-IR plasmonic antennas on silicon-rich oxinitride absorbing substrates: Nonlinear scaling of resonance wavelengths with antenna length

T. Šikola, R. D. Kekatpure, E. S. Barnard, J. S. White, P. Van Dorpe, L. Břínek, O. Tomanec, J. Zlámal, Dangyuan Lei, Y. Sonnefraud, S. A. Maier, J. Humlíček, M. L. Brongersma

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We report on the resonant properties of platinum dipole antennas fabricated on a silicon-rich-oxinitride thin film that exhibits significant absorption in the mid-infrared of the electromagnetic spectrum (λ-1≈1100 cm-1). A nonlinear scaling between the resonant wavelength and the antenna length has been found and quantitatively confirmed by full-field electromagnetic simulations. The resonant wavelength increases linearly with antenna length for small lengths and tends to saturate for large ones (length > 4 μm). This saturation effect is attributed to the coupling of a geometrical antenna resonance and an absorption resonance of the substrate material.
Original languageEnglish
Article number253109
JournalApplied Physics Letters
Issue number25
Publication statusPublished - 1 Dec 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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