Extraordinary properties of traditional hyperbolic metamaterials, not found in nature, arise from their man-made subwavelength structures causing unique light-matter interactions. However, their preparation requiring nanofabrication processes is highly challenging and merely provides nanoscale two-dimensional structures. Stabilizing their bulk forms via scalable procedures has been a sought-goal for broad applications of this technology. Herein, we report a new strategy of designing and realizing bulk metamaterials with finely tunable hyperbolic responses. We develop a facile two-step process: (1) self-assembly to obtain heterostructured nanohybrids of building blocks and (2) consolidation to convert nanohybrid powders to dense bulk pellets. Our samples have centimeter-scale dimensions typically, readily further scalable. Importantly, the thickness of building blocks and their relative concentration in bulk materials serve as a delicate means of controlling hyperbolic responses. The resulting new bulk heterostructured material system consists of the alternating h-BN and graphite/graphene nanolayers and exhibits significant modulation in both type-I and type-II hyperbolic resonance modes. It is the first example of real bulk hyperbolic metamaterials, consequently displaying the capability of tuning their responses along both in-plane and out-of-plane directions of the materials for the first time. It also distinctly interacts with unpolarized and polarized transverse magnetic and electronic beams to give unique hyperbolic responses. Our achievement can be a new platform to create various bulk metamaterials without complicated nanofabrication techniques. Our facile synthesis method using common laboratory techniques can open doors to broad-range researchers for active interdisciplinary studies for this otherwise hardly accessible technology.
|Number of pages||10|
|Journal||Journal of the American Chemical Society|
|Publication status||Published - 2021 Dec 15|
Bibliographical noteFunding Information:
The work at Seoul National University was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (Grant NRF-2020R1A2C2011111) and the Institute for Basic Science (Grants IBS-R009-D1 and IBS-R009-D2). This work was supported in part by the NRF through grants funded by the Korean government (Grant 2018M3D1A1058793). J.R. acknowledges the POSCO-POSTECH-RIST Convergence Research Center program funded by POSCO, POSTECH-Samsung Semiconductor Research Center program (Grant IO201215-08187-01) funded by Samsung Electronics, and the NRF grant (Grant NRF-2019R1A2C3003129) funded by the MSIT of the Korean government. S.S. acknowledges the NRF Global Ph.D. fellowship (Grant NRF-2017H1A2A1043322) funded by the Ministry of Education of the Korean government.
All Science Journal Classification (ASJC) codes
- Colloid and Surface Chemistry