| Reference : Optimisation of Terahertz Photomixer Layout |
| Dissertations and theses : Doctoral thesis | |||
| Engineering, computing & technology : Electrical & electronics engineering | |||
| http://hdl.handle.net/10993/17871 | |||
| Optimisation of Terahertz Photomixer Layout | |
| English | |
Juul, Lars  [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >] | |
| 7-Jul-2014 | |
| University of Luxembourg, Luxembourg | |
| Docteur en Sciences de l'Ingénieur | |
| 184 | |
| Marso, Michel | |
| Hadji-Minaglou, Jean-Régis | |
| Pereira, Mauro F. | |
| Mikulics, Martin | |
| Voos, Holger | |
| [en] Terahertz ; Photomixing ; Impedance matching | |
| [en] This thesis examines ways to improve the output power of LT GaAs terahertz
photomixer circuits, by focusing on the large impedance mismatch between photoconductor and antenna which gives rise to loss of a large fraction of power, which could potentially have been absorbed by the antenna. Impedance matching is a known problem in the microwave domain, and in this work such approaches were implemented in the terahertz domain and evaluated using a commercial numerical simulation tool with measured material properties. ?e aim was to provide cost effective design suggestions which are easily integrated into existing single layer technologies. Evaluation of high impedance antennas with integrated DC-blocking showed improvements ranging from 1.5 to 3 times the output power compared to the 3.0 µW reference case at 0.85 THz. A quarterwave transformer with an added shunt capacitance shows a 4 times improvement over the reference case. Adding a multilayer DC-block structure yields a 5 times improvement. Corrugated high impedance wire structures were evaluated for suitability in terms of radiative and transmission properties, in search for improved matching elements. Furthermore, a mechanically tunable resonant photomixer has been proposed, which yields significant improvement in output power over existing tunable broadband photomixers. Finally, a modulation scheme is proposed for binary ASK-modulation in the gigabit per second range of a terahertz photomixer, using an off the shelf 10 Gbps output driver. | |
| http://hdl.handle.net/10993/17871 |
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