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  • Title: Nanofocusing of terahertz wave in a tapered hyperbolic metal waveguide.
    Author: Gao H, Cao Q, Zhu M, Teng D, Shen S.
    Journal: Opt Express; 2014 Dec 29; 22(26):32071-81. PubMed ID: 25607173.
    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.
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