Modeling and performance analysis of photoconductive antennas for THz generation
Photoconductive antennas are devices capable of generating THz waves. In this thesis, we propose a model of THz wave generation in photoconductive antennas based on the Dude model. The derived equations explain the THz radiation when an optical pulse illuminates a photoconductor with an applied bias...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/374815 |
| Acceso en línea: | https://hdl.handle.net/2117/374815 |
| Access Level: | acceso abierto |
| Palabra clave: | Photoconductivity Terahertz technology Antennas (Electronics) Photoconductive THz wave generation THz antenna. Fotoconductivitat Antenes (Electrònica) Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Antenes i agrupacions d'antenes |
| Sumario: | Photoconductive antennas are devices capable of generating THz waves. In this thesis, we propose a model of THz wave generation in photoconductive antennas based on the Dude model. The derived equations explain the THz radiation when an optical pulse illuminates a photoconductor with an applied bias field. Furthermore, we derive an additional term appearing in the Drude equation that accounts for the generation of carriers with zero velocity. The model includes space-charge screening through a geometrical factor and radiation screening through an effective antenna impedance. The system is solved numerically using the iterative fixed-point method and Anderson acceleration. The fixed-point method convergence is limited, but Anderson acceleration can converge for a broader range of parameters. Analyzing the photocurrent at different optical powers, we find that it saturates at high optical powers due to the slowdown of the dynamics by the screening fields. |
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