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Broadband optical TaO antennas for directional emission of light. | LitMetric

AI Article Synopsis

  • * The paper presents the design of three optimized broadband traveling-wave tantalum pentoxide antennas, featuring a dipole emitter and enhanced directivity up to 119.
  • * The study combines simulations and experimental data, demonstrating high radiation efficiency and potential adaptability for various dielectric materials in on-chip applications.

Article Abstract

Highly directive antennas with the ability of shaping radiation patterns in desired directions are essential for efficient on-chip optical communication with reduced cross talk. In this paper, we design and optimize three distinct broadband traveling-wave tantalum pentoxide antennas exhibiting highly directional characteristics. Our antennas contain a director and reflector deposited on a glass substrate, which are excited by a dipole emitter placed in the feed gap between the two elements. Full-wave simulations in conjunction with global optimization provide structures with an enhanced linear directivity as high as 119 radiating in the substrate. The high directivity is a result of the interplay between two dominant TE modes and the leaky modes present in the antenna director. Furthermore, these low-loss dielectric antennas exhibit a near-unity radiation efficiency at the operational wavelength of 780 nm and maintain a broad bandwidth. Our numerical results are in good agreement with experimental measurements from the optimized antennas fabricated using a two-step electron-beam lithography, revealing the highly directive nature of our structures. We envision that our antenna designs can be conveniently adapted to other dielectric materials and prove instrumental for inter-chip optical communications and other on-chip applications.

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Source
http://dx.doi.org/10.1364/OE.455815DOI Listing

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