Tunable Plasmonic Properties and Absorption Enhancement in Terahertz Photoconductive Antenna Based on Optimized Plasmonic Nanostructures


Herein, we numerically investigate terahertz photoconductive antennas (PCAs) based on optimized plasmonic nanostructures and absorption enhancement in nanocylinders. Plasmonic behavior in the visible to near-infrared light spectrum is achievable due to the metallic nanostructure employment. Herein, we study the absorption enhancement of silver and transparent-conducting oxides (TCO) nanocylinders with different diameters by means of effective medium approximation. This study also reports on the stronger enhancement in the case of TCO nanocylinders. The results show that resonant absorption amplitude and wavelength are dramatically affected by the thickness of the nanostructure as well as by the distances between nanocylinders. The outputs reported here provide a fertile ground for precise control of the nanowire structures for sensing and other enhanced optical applications. It is worthwhile noting that in case of TCO nanocylinders, absorption enhancement for NIR wavelengths, being relevant for present terahertz generation setup, reaches up to fivefold leading to 25-fold increase in terahertz radiation.

Publication DOI: https://doi.org/10.1007/s10762-018-0516-0
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: The final publication is available at Springer via http://dx.doi.org/10.1007/s10762-018-0516-0
Publication ISSN: 1866-6906
Last Modified: 15 Apr 2024 07:27
Date Deposited: 04 Jul 2018 07:25
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Related URLs: https://link.sp ... 0762-018-0516-0 (Publisher URL)
PURE Output Type: Article
Published Date: 2018-10
Published Online Date: 2018-06-28
Accepted Date: 2018-06-21
Authors: Gric, Tatjana
Gorodetsky, Andrei (ORCID Profile 0000-0001-5440-2185)
Trofimov, Aleksej
Rafailov, Edik (ORCID Profile 0000-0002-4152-0120)



Version: Accepted Version

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