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Simulation and design of lateral photo-Dember emitters and a novel microwave antenna

Simulation and design of lateral photo-Dember emitters and a novel microwave antenna
Simulation and design of lateral photo-Dember emitters and a novel microwave antenna
In this thesis I will discuss the modelling and testing of THz and microwave emitters. I firstly present a new model for the lateral photo-Dember effect and find that the previous 1D model by Barnes et. al. is incomplete. I use a 2D solution of the drift diffusion equation and feed the currents in to a finite difference time domain algorithm. In order to have a realistic representation of the far-field to the detector I use a far-field algorithm.

I show that the dynamics of the system are dependent on the currents travelling perpendicular to the semiconductor surface, as opposed to just the lateral currents as previously thought. I then go on to compare this model with experimental results. The experiment in question involved the examination of photo-Dember emission when the semiconductor is under the influence of a biasing electric field. I also performed a separate experiment in which a gap was introduced to various lateral Photo-Dember emitters in order to observe its effects in both the time and frequency domains.

I also present a novel microwave antenna based on the fishscale and split-ring resonator metamaterial designs. I demonstrate that mutual coupling between the fishscale and SRRs is responsible for creating a greater absorption of the input signal than either
component is capable of in isolation. The antenna was tested, and I compare the experimental results with the computational model.
University of Southampton
Maple, Lewis C.
640a31c4-0cf3-46f1-a256-54c59ddb7ff0
Maple, Lewis C.
640a31c4-0cf3-46f1-a256-54c59ddb7ff0
Apostolopoulos, Vasileios
8a898740-4c71-4040-a577-9b9d70530b4d

Maple, Lewis C. (2017) Simulation and design of lateral photo-Dember emitters and a novel microwave antenna. University of Southampton, Doctoral Thesis, 115pp.

Record type: Thesis (Doctoral)

Abstract

In this thesis I will discuss the modelling and testing of THz and microwave emitters. I firstly present a new model for the lateral photo-Dember effect and find that the previous 1D model by Barnes et. al. is incomplete. I use a 2D solution of the drift diffusion equation and feed the currents in to a finite difference time domain algorithm. In order to have a realistic representation of the far-field to the detector I use a far-field algorithm.

I show that the dynamics of the system are dependent on the currents travelling perpendicular to the semiconductor surface, as opposed to just the lateral currents as previously thought. I then go on to compare this model with experimental results. The experiment in question involved the examination of photo-Dember emission when the semiconductor is under the influence of a biasing electric field. I also performed a separate experiment in which a gap was introduced to various lateral Photo-Dember emitters in order to observe its effects in both the time and frequency domains.

I also present a novel microwave antenna based on the fishscale and split-ring resonator metamaterial designs. I demonstrate that mutual coupling between the fishscale and SRRs is responsible for creating a greater absorption of the input signal than either
component is capable of in isolation. The antenna was tested, and I compare the experimental results with the computational model.

Text
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Published date: June 2017

Identifiers

Local EPrints ID: 419591
URI: http://eprints.soton.ac.uk/id/eprint/419591
PURE UUID: 03ace0b3-86ca-4be2-9f31-43eba2c1d272
ORCID for Vasileios Apostolopoulos: ORCID iD orcid.org/0000-0003-3733-2191

Catalogue record

Date deposited: 13 Apr 2018 16:31
Last modified: 18 May 2019 00:33

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