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Dielectric rod nanoantenna fed by a planar plasmonic waveguide

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Abstract

This paper presents a tapered dielectric rod antenna excited by a folded dipole coplanar waveguide operating at terahertz frequencies. The effective refractive index of the plasmonic transmission line is obtained by two numerical methods, the Finite Element Method and the Finite-Difference Time-Domain, and it is used to obtain the dimensions of the gap connected to the line. We examine the antenna using two lengths of the rod. For 10 and 5 μm tapered rods, impedance bandwidths of 43.47% and 32.55%, maximum gains of 12.58 and 9.84 dB, and radiation efficiencies of more than 72.09%, and 72.15% are achieved, respectively. The dielectric rod nanoantenna operates at all the optical communication band frequencies: original (O), extended (E), short (S), conventional (C), long (L), and ultra-long (U). The structure of the antenna consists of three layers. The substrate is made of silicon oxide. This paper discusses the effect of using a layer of silicon oxide to prevent direct contact between the silicon rod and the hollow T-shaped silver feedline.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Qom University of Technology, Khodakaram Blvd, Old Qom-Tehran, Road, Qom, Iran

    Erfan Ahmadi, Saeed Fakhte & Seyyed Sina Hosseini

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  1. Erfan Ahmadi
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  2. Saeed Fakhte
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  3. Seyyed Sina Hosseini
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SF wrote the main manuscript text and MMT prepared Figures. All authors reviewed the manuscript.

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Correspondence to Saeed Fakhte.

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Ahmadi, E., Fakhte, S. & Hosseini, S.S. Dielectric rod nanoantenna fed by a planar plasmonic waveguide. Opt Quant Electron 55, 115 (2023). https://doi.org/10.1007/s11082-022-04409-w

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