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Subwavelength Terahertz Waveguide Using Negative Permeability Metamaterial

Published online by Cambridge University Press:  31 January 2011

Atsushi Ishikawa,
Shuang Zhang,
Dentcho A Genov,
Guy Bartal and
Xiang Zhang
Atsushi Ishikawa
Affiliation:
a-ishikawa@berkeley.edu, University of California, Berkeley, NSF Nanoscale Science and Engineering Center, Berkeley, California, United States
Shuang Zhang
Affiliation:
zhangs@berkeley.edu, University of California, Berkeley, NSF Nanoscale Science and Engineering Center, Berkeley, California, United States
Dentcho A Genov
Affiliation:
dgenov@LaTech.edu, University of California, Berkeley, NSF Nanoscale Science and Engineering Center, Berkeley, California, United States
Guy Bartal
Affiliation:
bartal@me.berkeley.edu, University of California, Berkeley, NSF Nanoscale Science and Engineering Center, Berkeley, California, United States
Xiang Zhang
Affiliation:
xzhang@me.berkeley.edu, University of California, Berkeley, NSF Nanoscale Science and Engineering Center, Berkeley, California, United States
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Abstract

We propose a novel subwavelength terahertz (THz) waveguide using the magnetic plasmon polariton (MPP) mode guided by a narrow gap in a negative permeability metamaterial. Deep subwavelength wave-guiding (< λ/10) with a modest propagation loss (2.5 dB/λ) and group velocities down to c/21.8 is demonstrated in a straight waveguide, a 90-degree bend, and a splitter. The distinctive dispersions of the guided mode with positive and negative group velocities are explained analytically by considering the dispersive effective optical constants of the metamaterial. The proposed waveguiding system inherently has no cutoff for any core width and height, paving the way toward the deep subwavelength transport of THz waves for integrated THz device applications.

Keywords

optical propertiesnanostructuremagnetic properties

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