Self-assembled honeycomb lattices of dielectric colloidal nanospheres featuring photonic Dirac cones

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:	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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