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...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Online Access: | https://hdl.handle.net/10356/137403 |
| _version_ | 1826130092644892672 |
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| author | Lei, Qun-li Ni, Ran Ma, Yu-qiang |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Lei, Qun-li Ni, Ran Ma, Yu-qiang |
| author_sort | Lei, Qun-li |
| collection | NTU |
| 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. |
| first_indexed | 2024-10-01T07:51:14Z |
| format | Journal Article |
| id | ntu-10356/137403 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:51:14Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-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 |
| 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 |
| title | 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_short | Self-assembled chiral photonic crystals from a colloidal helix racemate |
| title_sort | self assembled chiral photonic crystals from a colloidal helix racemate |
| topic | Engineering::Chemical engineering Helix Self-assembly |
| url | https://hdl.handle.net/10356/137403 |
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