한빛사논문
- 조회731
Seokhyoung Kim,1,2† Cindy Y. Zheng,1,2† George C. Schatz,1,2 Koray Aydin,2,3 Kyoung-Ho Kim,4* Chad A. Mirkin1,2*
1Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
2International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208, USA
3Department of Electrical and Computer Engineering, Northwestern University, Evanston, IL 60208, USA
4Department of Physics, Chungbuk National University, Cheongju 28644, Republic of Korea
†These authors contributed equally
*Correspondence should be addressed to Chad A. Mirkin or Kyoung-ho Kim
Abstract
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.
논문정보
- Research article
- 2020년 10월 (BRIC 등록일 2020-11-02)
- 국내(교신)+국외 연구진
- 바이오·의료융합 > 바이오센싱 및 나노바이오물질
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