期刊
NANO LETTERS
卷 20, 期 11, 页码 8096-8101出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03089
关键词
colloidal metamaterials; 3D metamaterials; Mie resonances; DNA-mediated assembly; metacrystals
类别
资金
- Air Force Office of Scientific Research [FA9550-17-1-0348]
- Air Force Research Laboratory [FA8650-15-2-5518]
- Center for Bio-Inspired Energy Science, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0000989]
- Sherman Fairchild Foundation, Inc.
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF-EECS-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1720139]
- U.S. DOE Office of Science User Facility [DE-AC0205CH11231]
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2019R1C1C1006681]
- Office of Naval Research Young Investigator Program (ONR-YIP) award [N00014-17-1-2425]
- National Research Foundation of Korea [2019R1C1C1006681] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 similar to 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.
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