Kim, Yeongha, Wong, Stephan, Seo, Changwon, Yoon, Jeong Hoon, Choi, Gwan Hyun, Olthaus, Jan, Reiter, Doris E., Kim, Jeongyong, Kim, Teun-Teun, Oh, Sang Soon  ORCID: https://orcid.org/0000-0003-3093-7016 and Gi-Ra, Yi
2022.
Self-assembled honeycomb lattices of dielectric colloidal nanospheres featuring photonic Dirac cones.
ACS Applied Nano Material
5
(3)
, pp. 3386-3393.
10.1021/acsanm.1c03986
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Abstract
The prime example of a two-dimensional photonic crystal featuring Dirac cones is based on the honeycomb lattice. Colloidal self-assembly can produce a two-dimensional colloidal structure over a large area but is limited to hexagonal-close-packed structures. Therefore, it has been challenging to fabricate honeycomb monolayers by colloidal self-assembly. Here, we fabricate a dielectric honeycomb lattice in a large area by template-assisted self-assembly and analyze its photonic structure. Although the Dirac point occurring at the K point is not accessible by light in free space, a part of the upper Dirac cone above the light line is verified by a Fourier analysis of the back-focal-plane image. Because the template-assisted self-assembly enables additional geometrical perturbations in the honeycomb lattice, various lattices can be fabricated. This additional degree of freedom may provide an alternative way of fabricating photonic topological insulators.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Subjects: | Q Science > Q Science (General) |
| Publisher: | American Chemical Society |
| ISSN: | 2574-0970 |
| Funders: | European Regional Development Fund, National Research Foundation of Korea |
| Date of First Compliant Deposit: | 21 March 2022 |
| Date of Acceptance: | 22 February 2022 |
| Last Modified: | 12 Nov 2024 09:45 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/147967 |
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