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

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Authors	SIKOLA T. KEKAPTURE R.D. BARNARD E.S. WHITE J.S. VAN DORPE P. BRINEK L. TOMANEC O. ZLAMAL J. LEI D.Y. SONNENFRAUD Y. MAIER S.A. HUMLÍČEK Josef BRONGERSMA M.L.
Year of publication	2009
Type	Article in Periodical
Magazine / Source	Applied Physics Letters
MU Faculty or unit	Faculty of Science
Citation
Field	Solid matter physics and magnetism
Keywords	OPTICAL ANTENNAS; NANOANTENNAS; RESONATORS; SINGLE; BOWTIE; FILMS
Description	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) approximate to 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 mu m). This saturation effect is attributed to the coupling of a geometrical antenna resonance and an absorption resonance of the substrate material.
Related projects:	Physical and chemical properties of advanced materials and structures