Belardini A, Larciprete MC, Centini M, Fazio E, Sibilia C, Chiappe D, Martella C, Toma A, Giordano M, Buatier de Mongeot F. Circular dichroism in the optical second-harmonic emission of curved gold metal nanowires.
Phys Rev Lett 2011;
107:257401. [PMID:
22243110 DOI:
10.1103/physrevlett.107.257401]
[Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Indexed: 05/31/2023]
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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