Journal
OPTICA
Volume 8, Issue 10, Pages 1290-1295Publisher
Optica Publishing Group
DOI: 10.1364/OPTICA.430893
Keywords
-
Categories
Funding
- National Key Research and Development Program of China [2017YFA0205700]
- National Natural Science Foundation of China [61775194, 61950410608, 61975181]
Ask authors/readers for more resources
Dielectric super-absorbing metasurfaces achieve super-high absorption rates by breaking parity-time symmetry, opening up new possibilities in optical sensing, thermal emission, photovoltaics, and photodetection devices.
Dielectric super-absorbing (>50%) metasurfaces, born of necessity to break the 50% absorption limit of an ultrathin film, offer an efficient way to manipulate light. However, in previous works, super absorption in dielectric systems was predominately realized via making two modes reach the degenerate critical coupling condition, which restricted the two modes to be orthogonal. Here, we demonstrate that in nonorthogonal-mode systems, which represent a broader range of metasurfaces, super absorption can be achieved by breaking parity-time (PT) symmetry. As a proof of concept, super absorption (100% in simulation and 71% in experiment) at near-infrared frequencies is achieved in a Si-Ge-Si metasurface with two nonorthogonal modes. Engineering PT symmetry enriches the field of non-Hermitian flat photonics, opening-up new possibilities in optical sensing, thermal emission, photovoltaic, and photodetecting devices. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available