Tampere University of Technology

TUTCRIS Research Portal

Circular dichroism in the second harmonic field evidenced by asymmetric AU coated gaas nanowires

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalMicromachines
Volume11
Issue number2
DOIs
Publication statusPublished - 1 Feb 2020
Publication typeA1 Journal article-refereed

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, GaAs nanowires, Plasmonic coating, Second harmonic generation

Publication forum classification

Field of science, Statistics Finland