An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies

In this work, we present a rigorous full-wave eigenanalysis for the study of nanoantennas operating at both terahertz (THz) (0.1–10 THz), and infrared/optical (10–750 THz) frequency spectrums. The key idea behind this effort is to reveal the physical characteristics of nanoantennas such that we can...

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Autores principales:	Konstantinos D. Paschaloudis, Constantinos L. Zekios, Georgios C. Trichopoulos, Filippos Farmakis, George A. Kyriacou
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	terahertz antennas optical nanoantennas eigenanalysis finite element method Lorentz–Drude model Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/b942875841394c4abea7e4ce1e300fb3
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spelling	oai:doaj.org-article:b942875841394c4abea7e4ce1e300fb32021-11-25T17:24:36ZAn Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies10.3390/electronics102227822079-9292https://doaj.org/article/b942875841394c4abea7e4ce1e300fb32021-11-01T00:00:00Zhttps://www.mdpi.com/2079-9292/10/22/2782https://doaj.org/toc/2079-9292In this work, we present a rigorous full-wave eigenanalysis for the study of nanoantennas operating at both terahertz (THz) (0.1–10 THz), and infrared/optical (10–750 THz) frequency spectrums. The key idea behind this effort is to reveal the physical characteristics of nanoantennas such that we can transfer and apply the state-of-the-art antenna design methodologies from microwaves to terahertz and optics. Extensive attention is given to penetration depth in metals to reveal whether the surface currents are sufficient for the correct characterization of nanoantennas, or the involvement of volume currents is needed. As we show with our analysis, the penetration depth constantly reduces until the region of 200 THz; beyond this point, it shoots up, requiring volume currents for the exact characterization of the corresponding radiating structures. The cases of a terahertz rectangular patch antenna and a plasmonic nanoantenna are modeled, showing in each case the need of surface and volume currents, respectively, for the antenna’s efficient characterization.Konstantinos D. PaschaloudisConstantinos L. ZekiosGeorgios C. TrichopoulosFilippos FarmakisGeorge A. KyriacouMDPI AGarticleterahertz antennasoptical nanoantennaseigenanalysisfinite element methodLorentz–Drude modelElectronicsTK7800-8360ENElectronics, Vol 10, Iss 2782, p 2782 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	terahertz antennas optical nanoantennas eigenanalysis finite element method Lorentz–Drude model Electronics TK7800-8360
spellingShingle	terahertz antennas optical nanoantennas eigenanalysis finite element method Lorentz–Drude model Electronics TK7800-8360 Konstantinos D. Paschaloudis Constantinos L. Zekios Georgios C. Trichopoulos Filippos Farmakis George A. Kyriacou An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies
description	In this work, we present a rigorous full-wave eigenanalysis for the study of nanoantennas operating at both terahertz (THz) (0.1–10 THz), and infrared/optical (10–750 THz) frequency spectrums. The key idea behind this effort is to reveal the physical characteristics of nanoantennas such that we can transfer and apply the state-of-the-art antenna design methodologies from microwaves to terahertz and optics. Extensive attention is given to penetration depth in metals to reveal whether the surface currents are sufficient for the correct characterization of nanoantennas, or the involvement of volume currents is needed. As we show with our analysis, the penetration depth constantly reduces until the region of 200 THz; beyond this point, it shoots up, requiring volume currents for the exact characterization of the corresponding radiating structures. The cases of a terahertz rectangular patch antenna and a plasmonic nanoantenna are modeled, showing in each case the need of surface and volume currents, respectively, for the antenna’s efficient characterization.
format	article
author	Konstantinos D. Paschaloudis Constantinos L. Zekios Georgios C. Trichopoulos Filippos Farmakis George A. Kyriacou
author_facet	Konstantinos D. Paschaloudis Constantinos L. Zekios Georgios C. Trichopoulos Filippos Farmakis George A. Kyriacou
author_sort	Konstantinos D. Paschaloudis
title	An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies
title_short	An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies
title_full	An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies
title_fullStr	An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies
title_full_unstemmed	An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies
title_sort	eigenmode study of nanoantennas from terahertz to optical frequencies
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b942875841394c4abea7e4ce1e300fb3
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An Eigenmode Study of Nanoantennas from Terahertz to Optical Frequencies

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