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Proceedings Paper

Tuning circular dichroism by capping SiO2 nanohelixes upon silver nanohelixes
Author(s): Yi-Jun Jen; Jia-Liang You; Meng-Jie Lin; Wei-Chien Wang
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Paper Abstract

Three-dimensional chiral metamaterials, plasmonic nanohelixes, with chiroptical activity have attracted attention for many potential photonic applications. In previous works, glancing angle deposition (GLAD) has been applied to deposit various Ag nanohelix arrays on smooth substrates and the structure dependent circular dichroism has been measured and analyzed. In this work, two-turn SiO2 nanohelixes are grown upon Ag nanohelixes to form a SiO2-Ag nanohelix array. For the bottom Ag nanohelices, the average pitch length (P) and the radii of curvature (R) are 231nm and 137nm, respectively. P and R are 174nm and 118nm for the top SiO2 nanohelices, respectively. Under left-handed (righthanded) circularly polarized light illumination, the transmittance, reflectance, and extinctance of the SiO2-Ag nanohelix array are measured. The circular dichroism described with g-factor is also presented here as a function of wavelength. According to the measurement, the g-factor exhibits a shift phenomenon as the SiO2 nanohelixes are capped upon Ag nanohelixes. This phenomenon leads to flexible control over the circular dichroism of SiO2-Ag nanohelix arrays with respect to the resonance wavelength and amplitude of g-factor.

Paper Details

Date Published: 7 September 2018
PDF: 7 pages
Proc. SPIE 10731, Nanostructured Thin Films XI, 107310O (7 September 2018); doi: 10.1117/12.2318988
Show Author Affiliations
Yi-Jun Jen, National Taipei Univ. of Technology (Taiwan)
Jia-Liang You, National Taipei Univ. of Technology (Taiwan)
Meng-Jie Lin, National Taipei Univ. of Technology (Taiwan)
Wei-Chien Wang, National Taipei Univ. of Technology (Taiwan)

Published in SPIE Proceedings Vol. 10731:
Nanostructured Thin Films XI
Akhlesh Lakhtakia; Tom G. Mackay, Editor(s)

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