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Updated: May 31, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
Transverse electromagnetic modes in aperture waveguides containing a metamaterial with extreme anisotropy
Peter B Catrysse1, Shanhui Fan
1Department of Electrical Engineering, Stanford University, California 94305, USA. pcatryss@stanford.edu
Abstract:
We use metamaterials with extreme anisotropy to solve the fundamental problem of light transport in deep subwavelength apertures. By filling a simply connected aperture with an anisotropic medium, we decouple the cutoff frequency and the group velocity of modes inside apertures. In the limit of extreme anisotropy, all modes become purely transverse electromagnetic modes, free from geometrical dispersion, propagate with a velocity controlled by the transverse permittivity and permeability, and have zero cutoff frequency. We analyze physically realizable cases for a circular aperture and show a metamaterial design using existing materials.
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