Limits to the Optical Response of Graphene and 2D Materials
arXiv:1705.03582 · doi:10.1021/acs.nanolett.7b02007
Abstract
2D materials provide a platform for strong light--matter interactions, creating wide-ranging design opportunities via new-material discoveries and new methods for geometrical structuring. We derive general upper bounds to the strength of such light--matter interactions, given only the optical conductivity of the material, including spatial nonlocality, and otherwise independent of shape and configuration. Our material figure of merit shows that highly doped graphene is an optimal material at infrared frequencies, whereas single-atomic-layer silver is optimal in the visible. For quantities ranging from absorption and scattering to near-field spontaneous-emission enhancements and radiative heat transfer, we consider canonical geometrical structures and show that in certain cases the bounds can be approached, while in others there may be significant opportunity for design improvement. The bounds can encourage systematic improvements in the design of ultrathin broadband absorbers, 2D antennas, and near-field energy harvesters.
7 pages, 4 figures, plus references and supplementary material
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- Heuristic Methods and Performance Bounds for Photonic Design
- The Effect of Non-Local Electrical Conductivity on Near-Field Radiative Heat Transfer between Graphene Sheets
- Plasmonics in Argentene
- Optimal nanoparticle forces, torques, and illumination fields
- A place for two-dimensional plasmonics in electromagnetic wave detection
- Towards Maximum Optical Efficiency of Ensembles of Colloidal Nanorods
- Pico-photonics: Anomalous Atomistic Waves in Silicon
- Approaching the upper limits of the local density of states via optimized metallic cavities