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Controllable directive radiation from dipole emitter coupled to dielectric nanowire antenna with substrate-mediated tunability

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Abstract

The present work demonstrates controllable directive radiation of a dipolar emitter coupled to a substrate-supported dielectric nanowire antenna. Nanoactuators, transparent-conducting oxides, and graphene are integrated into the substrate, respectively, to establish tunable antenna platforms in visible, near-infrared (IR), and far-IR frequency regimes. We exploit the substrate-induced interference effects and tunability mechanisms in each antenna system to achieve directive radiation with real-time steering capability. The design and modeling are rigorously carried out using an efficient and accurate semi-analytical framework based on transition matrix formulation. Each configuration is optimized to achieve maximal steering range while attaining a proper gain. Owing to subwavelength footprint, enhanced directionality, real-time tunability, and fairly simple geometry, the proposed platforms are ideal candidates for nanoantenna synthesis.

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ACKNOWLEDGMENTS

The authors would like to acknowledge the supports from US Air Force Office of Scientific Research (AFOSR) FA9550-14-1-0349, US Army Research Office W911NF-15-1-0138, and Defense Advanced Research Projects Agency (DARPA) N00014-14-1-0850.

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Authors and Affiliations

  1. Metamaterials Lab, Electrical and Computer Engineering Department, Northeastern University, Boston, Massachusetts, 02115, USA

    Mohammad M. Salary, Ali Forouzmand & Hossein Mosallaei

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  1. Mohammad M. Salary
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  2. Ali Forouzmand
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  3. Hossein Mosallaei
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Corresponding author

Correspondence to Hossein Mosallaei.

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The supplementary material for this article can be found at https://doi.org/10.1557/mrc.2018.46

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Salary, M.M., Forouzmand, A. & Mosallaei, H. Controllable directive radiation from dipole emitter coupled to dielectric nanowire antenna with substrate-mediated tunability. MRS Communications 8, 437–445 (2018). https://doi.org/10.1557/mrc.2018.46

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