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

Published online by Cambridge University Press:  04 April 2018

Mohammad M. Salary Open the ORCID record for Mohammad M. Salary [Opens in a new window] ,
Ali Forouzmand  and
Hossein Mosallaei
Mohammad M. Salary
Affiliation:
Metamaterials Lab, Electrical and Computer Engineering Department, Northeastern University, Boston, Massachusetts 02115, USA
Ali Forouzmand
Affiliation:
Metamaterials Lab, Electrical and Computer Engineering Department, Northeastern University, Boston, Massachusetts 02115, USA
Hossein Mosallaei*
Affiliation:
Metamaterials Lab, Electrical and Computer Engineering Department, Northeastern University, Boston, Massachusetts 02115, USA
*
Address all correspondence to Hossein Mosallaei at [email protected]
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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.

Type
Research Letters
Information
MRS Communications , Volume 8 , Issue 2 , June 2018 , pp. 437 - 445
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Copyright
Copyright © Materials Research Society 2018 

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