Tuning circular dichroism by capping SiO2 nanohelixes upon silver nanohelixes

Yi Jun Jen; Jia Liang You; Meng Jie Lin; Wei Chien Wang

doi:10.1117/12.2318988

Tuning circular dichroism by capping SiO₂ nanohelixes upon silver nanohelixes

Yi Jun Jen
, Jia Liang You
, Meng Jie Lin
, Wei Chien Wang

Department of Electro-Optical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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.

Original language	English
Title of host publication	Nanostructured Thin Films XI
Editors	Tom G. Mackay, Akhlesh Lakhtakia
Publisher	SPIE
ISBN (Electronic)	9781510620339
DOIs	https://doi.org/10.1117/12.2318988
State	Published - 2018
Event	Nanostructured Thin Films XI 2018 - San Diego, United States Duration: 22 Aug 2018 → 23 Aug 2018

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	10731
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Nanostructured Thin Films XI 2018
Country/Territory	United States
City	San Diego
Period	22/08/18 → 23/08/18

Bibliographical note

Publisher Copyright:
© 2018 SPIE.

Keywords

GLAD
SiO-Ag nanohelix array
chiral metamaterials
circular dichroism

Access to Document

10.1117/12.2318988

Cite this

@inproceedings{eec3b4737c2a4e4eb562c5815911b5de,

title = "Tuning circular dichroism by capping SiO2 nanohelixes upon silver nanohelixes",

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.",

keywords = "GLAD, SiO-Ag nanohelix array, chiral metamaterials, circular dichroism",

author = "Jen, \{Yi Jun\} and You, \{Jia Liang\} and Lin, \{Meng Jie\} and Wang, \{Wei Chien\}",

note = "Publisher Copyright: {\textcopyright} 2018 SPIE.; Nanostructured Thin Films XI 2018 ; Conference date: 22-08-2018 Through 23-08-2018",

year = "2018",

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series = "Proceedings of SPIE - The International Society for Optical Engineering",

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Jen, YJ, You, JL, Lin, MJ & Wang, WC 2018, Tuning circular dichroism by capping SiO₂ nanohelixes upon silver nanohelixes. in TG Mackay & A Lakhtakia (eds), Nanostructured Thin Films XI., 107310O, Proceedings of SPIE - The International Society for Optical Engineering, vol. 10731, SPIE, Nanostructured Thin Films XI 2018, San Diego, United States, 22/08/18. https://doi.org/10.1117/12.2318988

Tuning circular dichroism by capping SiO₂ nanohelixes upon silver nanohelixes. / Jen, Yi Jun; You, Jia Liang; Lin, Meng Jie et al.
Nanostructured Thin Films XI. ed. / Tom G. Mackay; Akhlesh Lakhtakia. SPIE, 2018. 107310O (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10731).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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N2 - 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.

AB - 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.

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