Here we report the experimental observation of circular dichroism in the second-harmonic field (800-400 nm conversion) generated by self-organized gold nanowire arrays with subwavelength periodicity (160 nm). Such circular dichroism, raised by a nonlinear optical extrinsic chirality, is the evident signature of the sample morphology. It arises from the curvature of the self-assembled wires, producing a lack of symmetry at oblique incidence. The results were compared, both in the optical linear and nonlinear regime, with a reference sample composed of straight wires. Despite the weak extrinsic optical chirality of our samples (not observable by our optical linear measurements), high visibility (more than 50%) was obtained in the second-harmonic generated field.
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Titolo: | Circular Dichroism in the Optical Second-Harmonic Emission of Curved Gold Metal Nanowires | |
Autori: | ||
Data di pubblicazione: | 2011 | |
Rivista: | ||
Handle: | http://hdl.handle.net/11567/303733 | |
Appare nelle tipologie: | 01.01 - Articolo su rivista |