Degenerate critical coupling in all-dielectric metasurface absorbers
Abstract
We develop the theory of all-dielectric absorbers based on temporal coupled mode theory (TCMT), with parameters extracted from eigenfrequency simulations. An infinite square array of cylindrical resonators embedded in air is investigated, and we find that it supports two eigenmodes of opposite symmetry that are each responsible for half of the total absorption. The even and odd eigenmodes are found to be the hybrid electric (EH111) and hybrid magnetic (HE111) waveguide modes of a dielectric wire of circular cross section, respectively. The geometry of the cylindrical array is shown to be useful for individual tuning of the radiative loss rates of the eigenmodes, thus permitting frequency degeneracy. Further, by specifying the resonators’ loss tangent, the material loss rate can be made to equal the radiative loss rate, thus achieving a state of degenerate critical coupling and perfect absorption. Our results are supported by S-parameter simulations, and agree well with waveguide theory.
- Authors:
- Publication Date:
- Research Org.:
- Duke Univ., Durham, NC (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1395200
- Alternate Identifier(s):
- OSTI ID: 1395133
- Grant/Contract Number:
- SC0014372
- Resource Type:
- Published Article
- Journal Name:
- Optics Express
- Additional Journal Information:
- Journal Name: Optics Express Journal Volume: 25 Journal Issue: 20; Journal ID: ISSN 1094-4087
- Publisher:
- Optical Society of America
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Metamaterials; Absorption; Resonators
Citation Formats
Ming, Xianshun, Liu, Xinyu, Sun, Liqun, and Padilla, Willie J. Degenerate critical coupling in all-dielectric metasurface absorbers. United States: N. p., 2017.
Web. doi:10.1364/OE.25.024658.
Ming, Xianshun, Liu, Xinyu, Sun, Liqun, & Padilla, Willie J. Degenerate critical coupling in all-dielectric metasurface absorbers. United States. https://doi.org/10.1364/OE.25.024658
Ming, Xianshun, Liu, Xinyu, Sun, Liqun, and Padilla, Willie J. Wed .
"Degenerate critical coupling in all-dielectric metasurface absorbers". United States. https://doi.org/10.1364/OE.25.024658.
@article{osti_1395200,
title = {Degenerate critical coupling in all-dielectric metasurface absorbers},
author = {Ming, Xianshun and Liu, Xinyu and Sun, Liqun and Padilla, Willie J.},
abstractNote = {We develop the theory of all-dielectric absorbers based on temporal coupled mode theory (TCMT), with parameters extracted from eigenfrequency simulations. An infinite square array of cylindrical resonators embedded in air is investigated, and we find that it supports two eigenmodes of opposite symmetry that are each responsible for half of the total absorption. The even and odd eigenmodes are found to be the hybrid electric (EH111) and hybrid magnetic (HE111) waveguide modes of a dielectric wire of circular cross section, respectively. The geometry of the cylindrical array is shown to be useful for individual tuning of the radiative loss rates of the eigenmodes, thus permitting frequency degeneracy. Further, by specifying the resonators’ loss tangent, the material loss rate can be made to equal the radiative loss rate, thus achieving a state of degenerate critical coupling and perfect absorption. Our results are supported by S-parameter simulations, and agree well with waveguide theory.},
doi = {10.1364/OE.25.024658},
journal = {Optics Express},
number = 20,
volume = 25,
place = {United States},
year = {Wed Sep 27 00:00:00 EDT 2017},
month = {Wed Sep 27 00:00:00 EDT 2017}
}
https://doi.org/10.1364/OE.25.024658
Web of Science
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Works referencing / citing this record:
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