Previous second-harmonic-generation experiments on metallic split-ring-resonator arrays have been performed at fixed fundamental laser center frequency. Here, we perform nonlinear optical spectroscopy on a first set of samples, revealing pronounced resonances. Furthermore, to clarify the role of higher-order split-ring resonances, we perform additional experiments on a second set of samples in which the fundamental split-ring-resonator resonance frequencies are lithographically tuned, whereas the higher-order resonances are fixed. We find that the higher-order res onances merely reabsorb the second-harmonic generation, revealing the fundamental split-ring resonance as the nonlinear source.
© 2011 Optical Society of America
Original Manuscript: December 22, 2010
Revised Manuscript: March 4, 2011
Manuscript Accepted: March 24, 2011
Published: April 20, 2011
Fabian B. P. Niesler, Nils Feth, Stefan Linden, and Martin Wegener, "Second-harmonic optical spectroscopy on split-ring-resonator arrays," Opt. Lett. 36, 1533-1535 (2011)