Nanofocusing of terahertz wave in a tapered hyperbolic metal waveguide |
Optics Express, Vol. 22, Issue 26, pp. 32071-32081 (2014)
http://dx.doi.org/10.1364/OE.22.032071
http://dx.doi.org/10.1364/OE.22.032071
Abstract
An tapered hyperbolic metal waveguide is suggested for the nanofocusing of terahertz waves. We numerically show that, at the frequency of 1 THz, the focal spot can be as small as only 5 nm, which is smaller than that of a plate waveguide by 2 orders of magnitude. Correspondingly, the longitudinal component of the energy flow density is stronger than that of a plate waveguide by 3 orders of magnitude for the same input. It is shown that these significant improvements come from the small imaginary part of the effective index of the hyperbolic metal waveguide.
© 2014 Optical Society of America
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