Details

Autor(en) / Beteiligte

• Belardini, A
• Larciprete, M C
• Centini, M
• Fazio, E
• Sibilia, C
• Chiappe, D
• Martella, C
• Toma, A
• Giordano, M
• Buatier de Mongeot, F

Titel

Circular dichroism in the optical second-harmonic emission of curved gold metal nanowires

Ist Teil von

• Physical review letters, 2011-12, Vol.107 (25), p.257401-257401, Article 257401

Ort / Verlag

United States

Erscheinungsjahr

2011

Quelle

APS

Beschreibungen/Notizen

• 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.