Abstract
A terahertz (THz) waveguide using a metallic nanoslit whose width is much smaller
than the skin depth is analytically investigated. By taking some important physical
properties into account, we derive a simple, yet accurate, expression for the effective
index. We also study the changes in modal field and the attenuation coefficient in the
whole THz region, and find some interesting physical properties. Finally, we verify that
these theoretical analyses coincide with the rigorous numerical simulations. This
research can be useful for various applications of THz waveguides made of metallic
nanoslits.
© 2016 Chinese Laser Press
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