By irradiation of thin gold films with single pulses of fs-laser radiation, upright standing gold nanoantennas with lengths up to approx. 2 µm and tip diameters of less than 100 nm are produced. The antennas exhibit resonant extinction in the near infrared and can there-fore be used for optical near-field amplification with potential applications for e.g. surface enhanced IR spectroscopy. The resonance wavelength is approx. four times the antenna length and can be tuned by the processing parameters used for the fabrication of the nanoantennas. The influence of different processing parameters on the antenna length and its correlation to the observed resonance wavelength in FTIR spectra are investigated.
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