Mid-IR plasmonic antennas on silicon-rich oxinitride absorbing substrates: Nonlinear scaling of resonance wavelengths with antenna length
Název česky | Plasmonické antény pro střední infračervenou oblast: nelineární souvislost rezonanční vlnové délky s délkou antény |
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Autoři | |
Rok publikování | 2009 |
Druh | Článek v odborném periodiku |
Časopis / Zdroj | Applied Physics Letters |
Fakulta / Pracoviště MU | |
Citace | |
Obor | Fyzika pevných látek a magnetismus |
Klíčová slova | OPTICAL ANTENNAS; NANOANTENNAS; RESONATORS; SINGLE; BOWTIE; FILMS |
Popis | 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. |
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