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

journal article - other

English

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 (lambda-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 of 0.004 mm. This saturation effect is attributed to the coupling of a geometrical antenna resonance and an absorption resonance of the substrate material.

dipole antennas; infrared spectra; plasmonics; platinum; silicon compounds; thin films

ŠIKOLA, T.; KEKATPURE, R.; BARNARD, E.; WHITE, J.; VAN DORPE, P.; BŘÍNEK, L.; TOMANEC, O.; ZLÁMAL, J.; LEI, D.; SONNEFRAUD, Y.; MAIER, S.; HUMLÍČEK, J.; BRONGERSMA, M.

2009

22. 12. 2009

0003-6951

Applied Physics Letters

95

25

United States of America

253109-1

253109-3

3