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Self-Assembled Honeycomb Lattices of Dielectric Colloidal Nanospheres Featuring Photonic Dirac Cones SCIE SCOPUS

Title
Self-Assembled Honeycomb Lattices of Dielectric Colloidal Nanospheres Featuring Photonic Dirac Cones
Authors
Yeongha KimStephan WongChangwon SeoYOON, JEONGHOONGwan Hyun ChoiJan OlthausDoris E. ReiterJeongyong KimPil Jin YooTeun-Teun KimSang Soon OhYI, GI RA
Date Issued
2022-03
Publisher
American Chemical Society
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. © 2022 American Chemical Society. All rights reserved.
URI
https://oasis.postech.ac.kr/handle/2014.oak/116585
DOI
10.1021/acsanm.1c03986
ISSN
2574-0970
Article Type
Article
Citation
ACS Applied Nano Materials, vol. 5, no. 3, page. 3386 - 3393, 2022-03
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