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Degenerate critical coupling in all-dielectric metasurface absorbers.

Publication ,  Journal Article
Ming, X; Liu, X; Sun, L; Padilla, WJ
Published in: Optics express
October 2017

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.

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Published In

Optics express

DOI

EISSN

1094-4087

ISSN

1094-4087

Publication Date

October 2017

Volume

25

Issue

20

Start / End Page

24658 / 24669

Related Subject Headings

  • Optics
  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 4006 Communications engineering
  • 1005 Communications Technologies
  • 0906 Electrical and Electronic Engineering
  • 0205 Optical Physics
 

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Ming, X., Liu, X., Sun, L., & Padilla, W. J. (2017). Degenerate critical coupling in all-dielectric metasurface absorbers. Optics Express, 25(20), 24658–24669. https://doi.org/10.1364/oe.25.024658
Ming, Xianshun, Xinyu Liu, Liqun Sun, and Willie J. Padilla. “Degenerate critical coupling in all-dielectric metasurface absorbers.Optics Express 25, no. 20 (October 2017): 24658–69. https://doi.org/10.1364/oe.25.024658.
Ming X, Liu X, Sun L, Padilla WJ. Degenerate critical coupling in all-dielectric metasurface absorbers. Optics express. 2017 Oct;25(20):24658–69.
Ming, Xianshun, et al. “Degenerate critical coupling in all-dielectric metasurface absorbers.Optics Express, vol. 25, no. 20, Oct. 2017, pp. 24658–69. Epmc, doi:10.1364/oe.25.024658.
Ming X, Liu X, Sun L, Padilla WJ. Degenerate critical coupling in all-dielectric metasurface absorbers. Optics express. 2017 Oct;25(20):24658–24669.
Journal cover image

Published In

Optics express

DOI

EISSN

1094-4087

ISSN

1094-4087

Publication Date

October 2017

Volume

25

Issue

20

Start / End Page

24658 / 24669

Related Subject Headings

  • Optics
  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 4006 Communications engineering
  • 1005 Communications Technologies
  • 0906 Electrical and Electronic Engineering
  • 0205 Optical Physics