Self-assembled chiral photonic crystals from a colloidal helix racemate

Chiral crystals consisting of microhelices have many optical properties, while presently available fabrication processes limit their large-scale applications in photonic devices. Here, by using a simplified simulation method, we investigate a bottom-up self-assembly route to build up helical crystal...

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Main Authors: Lei, Qun-li, Ni, Ran, Ma, Yu-qiang
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/137403
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1374032023-12-29T06:52:56Z Self-assembled chiral photonic crystals from a colloidal helix racemate Lei, Qun-li Ni, Ran Ma, Yu-qiang School of Chemical and Biomedical Engineering Engineering::Chemical engineering Helix Self-assembly Chiral crystals consisting of microhelices have many optical properties, while presently available fabrication processes limit their large-scale applications in photonic devices. Here, by using a simplified simulation method, we investigate a bottom-up self-assembly route to build up helical crystals from the smectic monolayer of a colloidal helix racemate. With increasing the density, the system undergoes an entropy-driven cocrystallization by forming crystals of various symmetries with different helical shapes. In particular, we identify two crystals of helices arranged in binary honeycomb and square lattices, which are essentially composed of two sets of opposite-handed chiral crystals. Photonic calculations show that these chiral structures can have large complete photonic band gaps. In addition, in the self-assembled chiral square crystal, we also find dual polarization band gaps that selectively forbid the propagation of circularly polarized light of a specific handedness along the helical axis direction. The self-assembly process in our proposed system is robust, suggesting possibilities of using chiral colloids to assemble photonic metamaterials. MOE (Min. of Education, S’pore) Accepted version 2020-03-24T04:21:58Z 2020-03-24T04:21:58Z 2018 Journal Article Lei, Q., Ni, R., & Ma, Y. (2018). Self-assembled chiral photonic crystals from a colloidal helix racemate. ACS Nano, 12(7), 6860-6870. doi:10.1021/acsnano.8b02116 1936-0851 https://hdl.handle.net/10356/137403 10.1021/acsnano.8b02116 29889494 2-s2.0-85048540178 7 12 6860 6870 en ACS Nano This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsnano.8b02116 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Chemical engineering
Helix
Self-assembly
spellingShingle Engineering::Chemical engineering
Helix
Self-assembly
Lei, Qun-li
Ni, Ran
Ma, Yu-qiang
Self-assembled chiral photonic crystals from a colloidal helix racemate
description Chiral crystals consisting of microhelices have many optical properties, while presently available fabrication processes limit their large-scale applications in photonic devices. Here, by using a simplified simulation method, we investigate a bottom-up self-assembly route to build up helical crystals from the smectic monolayer of a colloidal helix racemate. With increasing the density, the system undergoes an entropy-driven cocrystallization by forming crystals of various symmetries with different helical shapes. In particular, we identify two crystals of helices arranged in binary honeycomb and square lattices, which are essentially composed of two sets of opposite-handed chiral crystals. Photonic calculations show that these chiral structures can have large complete photonic band gaps. In addition, in the self-assembled chiral square crystal, we also find dual polarization band gaps that selectively forbid the propagation of circularly polarized light of a specific handedness along the helical axis direction. The self-assembly process in our proposed system is robust, suggesting possibilities of using chiral colloids to assemble photonic metamaterials.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Lei, Qun-li
Ni, Ran
Ma, Yu-qiang
format Article
author Lei, Qun-li
Ni, Ran
Ma, Yu-qiang
author_sort Lei, Qun-li
title Self-assembled chiral photonic crystals from a colloidal helix racemate
title_short Self-assembled chiral photonic crystals from a colloidal helix racemate
title_full Self-assembled chiral photonic crystals from a colloidal helix racemate
title_fullStr Self-assembled chiral photonic crystals from a colloidal helix racemate
title_full_unstemmed Self-assembled chiral photonic crystals from a colloidal helix racemate
title_sort self-assembled chiral photonic crystals from a colloidal helix racemate
publishDate 2020
url https://hdl.handle.net/10356/137403
_version_ 1787136757088649216