Strong terahertz absorption in all-dielectric Huygens' metasurfaces

Michael A. Cole; David A. Powell; Ilya V. Shadrivov

doi:10.1088/0957-4484/27/42/424003

Strong terahertz absorption in all-dielectric Huygens' metasurfaces

Michael A. Cole, David A. Powell, Ilya V. Shadrivov

Research output: Contribution to journal › Article › peer-review

67 Citations (Scopus)

Abstract

We propose an all dielectric metamaterial that acts as a perfect terahertz absorber without a ground plane. The unit cell consists of a dielectric cylinder embedded in a low index material. In order to achieve near-perfect terahertz absorption (99.5%) we employ impedance matching of the electric and magnetic resonances within the cylinders of the Huygens' metasurface. The impedance matching is controlled by changing the aspect ratio between the height and diameter of the cylinder. We show that the absorption resonance can be tuned to particular frequencies from 0.3 to 1.9 THz via changing the geometry of the structure while keeping a nearly constant aspect ratio of the cylinders.

Original language	English
Article number	424003
Journal	Nanotechnology
Volume	27
Issue number	42
DOIs	https://doi.org/10.1088/0957-4484/27/42/424003
Publication status	Published - 19 Sept 2016

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title = "Strong terahertz absorption in all-dielectric Huygens' metasurfaces",

abstract = "We propose an all dielectric metamaterial that acts as a perfect terahertz absorber without a ground plane. The unit cell consists of a dielectric cylinder embedded in a low index material. In order to achieve near-perfect terahertz absorption (99.5%) we employ impedance matching of the electric and magnetic resonances within the cylinders of the Huygens' metasurface. The impedance matching is controlled by changing the aspect ratio between the height and diameter of the cylinder. We show that the absorption resonance can be tuned to particular frequencies from 0.3 to 1.9 THz via changing the geometry of the structure while keeping a nearly constant aspect ratio of the cylinders.",

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Strong terahertz absorption in all-dielectric Huygens' metasurfaces

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