Scalable, Highly Uniform, and Robust Colloidal Mie Resonators for All-Dielectric Soft Meta-Optics
- Authors
- Cho, YongDeok; Huh, Ji-Hyeok; Kim, Kwangjin; Lee, Seungwoo
- Issue Date
- 2월-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- 3D all-dielectric meta-optics; colloids; selenium; self-assembly; soft nanophotonics
- Citation
- ADVANCED OPTICAL MATERIALS, v.7, no.3
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED OPTICAL MATERIALS
- Volume
- 7
- Number
- 3
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/67805
- DOI
- 10.1002/adom.201801167
- ISSN
- 2195-1071
- Abstract
- All-dielectric nanoparticles (NPs) with high (>3.0) or moderate (1.7-3.0) refractive indices have become fundamental to meta-optics, as they enable low-loss, low-heating, and quenching-free magnetodielectric Mie resonances, which are difficult to achieve by use of plasmonic counterparts. However, a scalable and versatile synthetic route for such magnetodielectric NPs retaining high uniformity, roundness, and robustness has remained elusive. Thus, soft self-assembly still represents an underutilized method in the optical engineer's toolset, which in turn limits the accessible range of meta-optics. Herein, a gram-scale and versatile synthesis of dielectric colloidal Mie resonators is presented, in which selenous acid precursors are converted into highly uniform, crystalline colloids by a low demand reaction. These crystalline selenium (c-Se) colloids enable strong electric and magnetic resonances due to their moderate refractive index (2.8-3.2 at optical frequencies), while simultaneously satisfying the requirements of high uniformity, roundness, and robustness. Even with these exotic properties, c-Se colloids are successfully self-assembled into various all-dielectric meta-optics systems including (i) metafluids exhibiting directional scattering, (ii) metamolecules with nanogap-dielectric resonances, and (iii) metacrystals with magnetodielectric bandgaps. The design space of all-dielectric meta-optics will be greatly expanded by utilizing soft self-assembly of c-Se colloids.
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Collections - Graduate School > KU-KIST Graduate School of Converging Science and Technology > 1. Journal Articles
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