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Third-harmonic spectroscopy and modeling of the nonlinear response of plasmonic nanoantennas

2012; Optica Publishing Group; Volume: 37; Issue: 22 Linguagem: Inglês

10.1364/ol.37.004741

1539-4794

Bernd Metzger, Mario Hentschel, Markus Lippitz, Harald Gießen,

Photonic and Optical Devices

We perform third-harmonic (TH) spectroscopy on rod-type gold nanoantenna arrays using widely tunable sub-30 fs laser pulses. We find the peak of the TH generation efficiency of the antenna arrays always slightly redshifted with respect to the peak of their linear extinction spectrum. We model the wavelength-dependent TH response quantitatively using a nonlinear harmonic oscillator model.