Influence of substrate material on radiation characteristics of thz photoconductive emitters

  • We present in this paper spectral and spatial characteristics of terahertz emission from standard dipole antenna structures used as emitters depending on the substrate material. All antenna structures were lithographically fabricated on low-temperature (LT) grown, few-micrometers-thick gallium arsenide (GaAs) layers. To investigate the effect of the substrate material on the radiation pattern of terahertz beams, either semi-insulating gallium arsenide or high-resistivity silicon substrate wafers have been used. As detector a standard 40 µm long dipole antenna on a semi-insulating GaAs substrate with a low-temperature grown gallium arsenide layer on it has been employed; this configuration allows for broadband detection and is still efficient enough for the characterization purpose. Strong dependence of the radiation pattern on the substrate used for the terahertz source is demonstrated. The measured patterns and differences between the two cases of substrates are well explained by means of classical diffraction.

Download full text files

Export metadata

Author:Jens Klier, Garik Torosyan, Nina Susan Schreiner, Daniel Molter, Frank Ellrich, Wissem Zouaghi, Emilien Peytavit, Jean-François Lampin, René Beigang, Joachim Jonuscheit, Georg von Freymann
Parent Title (English):International journal of antennas and propagation
Place of publication:New York, NY
Contributor(s):Francisco Falcone
Document Type:Article
Year of Completion:2015
Year of first Publication:2015
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2019/08/05
Issue:Art. 540175
Page Number:8
First Page:1
Last Page:7
Copyright © 2015 Jens Klier et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 3.0