Issue 8, 2016

Tailorable chiroptical activity of metallic nanospiral arrays

Abstract

The engineering of the chiroptical activity of the emerging chiral metamaterial, metallic nanospirals, is in its infancy. We utilize glancing angle deposition (GLAD) to facilely sculpture the helical structure of silver nanospirals (AgNSs), so that the scope of chiroptical engineering factors is broadened to include the spiral growth of homochiral AgNSs, the combination of left- and right-handed helical chirality to create heterochiral AgNSs, and the coil-axis alignment of the heterochiral AgNSs. It leads to flexible control over the chiroptical activity of AgNS arrays with respect to the sign, resonance wavelength and amplitude of circular dichroism (CD) in the UV and visible regime. The UV chiroptical mode has a distinct response from the visible mode. Finite element simulation together with LC circuit theory illustrates that the UV irradiation is mainly adsorbed in the metal and the visible is preferentially scattered by the AgNSs, accounting for the wavelength-related chiroptical distinction. This work contributes to broadening the horizons in understanding and engineering chiroptical responses, primarily desired for developing a wide range of potential chiroplasmonic applications.

Graphical abstract: Tailorable chiroptical activity of metallic nanospiral arrays

Supplementary files

Article information

Article type
Paper
Submitted
12 Sep 2015
Accepted
14 Oct 2015
First published
16 Oct 2015

Nanoscale, 2016,8, 4504-4510

Author version available

Tailorable chiroptical activity of metallic nanospiral arrays

J. Deng, J. Fu, J. Ng and Z. Huang, Nanoscale, 2016, 8, 4504 DOI: 10.1039/C5NR06291H

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