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Proceedings Paper

Modified bow-tie antenna with strong broadband field enhancement for RF photonic applications
Author(s): Shiyi Wang; Qiwen Zhan
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Paper Abstract

We present a novel design of a subwavelength modified bow-tie antenna that is capable of generating strong broadband field enhancement in its extended feed gap. This modified bow-tie antenna is comprised of a conventional bow-tie antenna with capacitive extended bars attached to the apex points of the bow-tie. The feed gap between the two capacitive bars is separated with a deep subwavelength width for the generation of enhanced local electrical field. Threedimensional finite element method model is utilized to systematically explore the properties of this antenna design. Through adjusting the bow-tie geometry and the substrate properties, the antenna structure is optimized with a central resonant frequency at 100 GHz. Highly enhanced electrical field is created between the extended bar under radio frequency (RF) illumination. With the optimized design, numerical simulations show that a uniform field enhancement of more than 200 through the entire feed gap with a bandwidth of 40 GHz can be achieved. The strongly enhanced RF field within the gap can be applied to directly modulate guided optical wave propagating in a waveguide embedded in the substrate underneath the feed gap. This work builds up a bridge between devices in the RF and optical frequency regimes that may find many potential applications in RF photonic devices and systems.

Paper Details

Date Published: 11 September 2013
PDF: 6 pages
Proc. SPIE 8806, Metamaterials: Fundamentals and Applications VI, 88061V (11 September 2013); doi: 10.1117/12.2024087
Show Author Affiliations
Shiyi Wang, Univ. of Dayton (United States)
Qiwen Zhan, Univ. of Dayton (United States)


Published in SPIE Proceedings Vol. 8806:
Metamaterials: Fundamentals and Applications VI
Allan D. Boardman; Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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