Circular dichroism in the optical second-harmonic emission of curved gold metal nanowires |
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Authors: | Belardini A Larciprete M C Centini M Fazio E Sibilia C Chiappe D Martella C Toma A Giordano M Buatier de Mongeot F |
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Institution: | Dipartimento di Scienze di Base e Applicate per l'Ingegneria, Sapienza Università di Roma and CNISM, Via A. Scarpa 16, I-00161 Roma, Italy. alessandro.belardini@uniroma1.it |
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Abstract: | 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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