**Alessandro Belardini 1,\*, Grigore Leahu 1, Emilija Petronijevic 1, Teemu Hakkarainen 2, Eero Koivusalo 2, Marcelo Rizzo Piton 2, Soile Talmila 2, Mircea Guina <sup>2</sup> and Concita Sibilia <sup>1</sup>**


Received: 22 January 2020; Accepted: 20 February 2020; Published: 23 February 2020

**Abstract:** Optical circular dichroism (CD) is an important phenomenon in nanophotonics, that addresses top level applications such as circular polarized photon generation in optics, enantiomeric recognition in biophotonics and so on. Chiral nanostructures can lead to high CD, but the fabrication process usually requires a large effort, and extrinsic chiral samples can be produced by simpler techniques. Glancing angle deposition of gold on GaAs nanowires can (NWs) induces a symmetry breaking that leads to an optical CD response that mimics chiral behavior. The GaAs NWs have been fabricated by a self-catalyzed, bottom-up approach, leading to large surfaces and high-quality samples at a relatively low cost. Here, we investigate the second harmonic generation circular dichroism (SHG-CD) signal on GaAs nanowires partially covered with Au. SHG is a nonlinear process of even order, and thus extremely sensitive to symmetry breaking. Therefore, the visibility of the signal is very high when the fabricated samples present resonances at first and second harmonic frequencies (i.e., 800 and 400 nm, in our case).

**Keywords:** extrinsic chirality; second harmonic generation; GaAs nanowires; plasmonic coating
