Ultralight Angstrom-Scale Optimal Optical Reflectors
[2];
[3];
[4];
- California Inst. of Technology (CalTech), Pasadena, CA (United States). Dept. of Applied Physics and Materials Science
- Harvard Univ., Cambridge, MA (United States). John A. Paulson School of Engineering and Applied Sciences
- Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Materials Science and Engineering
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
- Univ. of Zagreb (Croatia). Dept. of Physics. Faculty of Science
- Univ. of Pennsylvania, Philadelphia, PA (United States). School of Engineering and Applied Sciences
High reflectance in many state-of-the-art optical devices is achieved with noble metals. However, metals are limited by losses and, for certain applications, by their high mass density. Using a combination of ab initio and optical transfer matrix calculations, we evaluate the behavior of graphene-based angstrom-scale metamaterials and find that they could act as nearly perfect reflectors in the mid–long-wave infrared (IR) range. The low density of states for electron–phonon scattering and interband excitations leads to unprecedented optical properties for graphene heterostructures, especially alternating atomic layers of graphene and hexagonal boron nitride, at wavelengths greater than 10 μm. At these wavelengths, these materials exhibit reflectivities exceeding 99.7% at a fraction of the weight of noble metals, as well as plasmonic mode confinement and quality factors that are greater by an order of magnitude compared to noble metals. These findings hold promise for ultracompact optical components and waveguides for mid-IR applications. Moreover, unlike metals, the photonic properties of these heterostructures could be actively tuned via chemical and/or electrostatic doping, providing exciting possibilities for tunable devices.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0001299; AC02-05CH11231
- OSTI ID:
- 1470499
- Alternate ID(s):
- OSTI ID: 1488928
- Journal Information:
- ACS Photonics, Vol. 5, Issue 2; ISSN 2330-4022
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Optoelectronic response of the type-I Weyl semimetals TaAs and NbAs from first principles
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journal | January 2020 |
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