Mie-Resonant Three-Dimensional Metacrystals
Autor: | George C. Schatz, Chad A. Mirkin, Cindy Y. Zheng, Kyoung-Ho Kim, Seokhyoung Kim, Koray Aydin |
---|---|
Rok vydání: | 2020 |
Předmět: |
Materials science
business.industry Mechanical Engineering Physics::Optics Cloaking Metamaterial Optical computing Bioengineering 02 engineering and technology General Chemistry Colloidal crystal 021001 nanoscience & nanotechnology Condensed Matter Physics Polarization (waves) Photonic metamaterial Negative refraction Optoelectronics General Materials Science 0210 nano-technology business Refractive index |
Zdroj: | Nano Letters. 20:8096-8101 |
ISSN: | 1530-6992 1530-6984 |
Popis: | Optical metamaterials, engineered to exhibit electromagnetic properties not found in natural materials, may enable new light-based applications including cloaking and optical computing. While there have been significant advances in the fabrication of two-dimensional metasurfaces, planar structures create nontrivial angular and polarization sensitivities, making omnidirectional operation impossible. Although three-dimensional (3D) metamaterials have been proposed, their fabrication remains challenging. Here, we use colloidal crystal engineering with DNA to prepare isotropic 3D metacrystals from Au nanocubes. We show that such structures can exhibit refractive indices as large as ∼8 in the mid-infrared, far greater than that of common high-index dielectrics. Additionally, we report the first observation of multipolar Mie resonances in metacrystals with well-formed habits, occurring in the mid-infrared for submicrometer metacrystals, which we measured using synchrotron infrared microspectroscopy. Finally, we predict that arrays of metacrystals could exhibit negative refraction. The results present a promising platform for engineering devices with unnatural optical properties. |
Databáze: | OpenAIRE |
Externí odkaz: |