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Title: 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:
 [1];  [2];  [3]; ORCiD logo [2]
  1. Tsinghua Univ., Beijing (China). State Key Laboratory of Precision Measurement Technology and Instruments; Duke Univ., Durham, NC (United States). Department of Electrical and Computer Engineering
  2. Duke Univ., Durham, NC (United States). Department of Electrical and Computer Engineering
  3. Tsinghua Univ., Beijing (China). State Key Laboratory of Precision Measurement Technology and Instruments
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:
Journal Article: Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 20; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
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. doi: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. doi: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}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1364/OE.25.024658

Citation Metrics:
Cited by: 3 works
Citation information provided by
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