Spiral-type terahertz antennas and the manifestation of the Mushiake principle | Zendy

Ranjan Singh | Zendy; Carsten Rockstuhl | Zendy; Christoph Menzel | Zendy; T. P. Meyrath | Zendy; Mingxia He | Zendy; Harald Gießen | Zendy; F. Lederer | Zendy; Weili Zhang | Zendy

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Spiral-type terahertz antennas and the manifestation of the Mushiake principle

Author(s) -

Ranjan Singh,

Carsten Rockstuhl,

Christoph Menzel,

T. P. Meyrath,

Mingxia He,

Harald Gießen,

F. Lederer,

Weili Zhang

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.009971

Subject(s) - terahertz radiation , optics , spiral antenna , metamaterial , reflection coefficient , physics , spiral (railway) , electrical impedance , transmission coefficient , antenna (radio) , reflection (computer programming) , wavelength , transmission (telecommunications) , dipole antenna , telecommunications , mathematics , mathematical analysis , computer science , quantum mechanics , coaxial antenna , programming language

We report on the experimental and theoretical study of the resonant eigenmodes of spiral-type terahertz antennas. The analysis is carried out for a varying number of spiral windings. For larger numbers the structure possesses a self-complementary property which allows the application of the Mushiake principle predicting that the impedance of such structures is half the impedance of free space. This permits to observe an equal and frequency independent reflection and transmission coefficient. This property makes the spiral-type terahertz antenna not only a fascinating example of a medium supporting strong resonances in the long wavelength limit but also a medium which can be easily and reasonably homogenized at higher frequencies. This is in stark contrast to most of the existing metamaterials.

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