Design and optimization of terahertz waveguides with low loss and dispersion
Electromagnetic waves in the terahertz spectral range have gained significant research focus due to their applications in various fields of science. To effectively generate and integrate terahertz waves in systems, appropriate waveguide design is critical. Conventionally waveguides have been used...
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ndltd-uvic.ca-oai-dspace.library.uvic.ca-1828-120902020-09-03T05:29:38Z Design and optimization of terahertz waveguides with low loss and dispersion Shiran, Vahid Darcie, Thomas Edward Terahertz waveguide On-chip-system Low loss Electromagnetic waves in the terahertz spectral range have gained significant research focus due to their applications in various fields of science. To effectively generate and integrate terahertz waves in systems, appropriate waveguide design is critical. Conventionally waveguides have been used to control the propagation of electromagnetic waves. A waveguide with low loss and dispersion is always preferred. But achieving these characteristics is quite challenging especially if operating in the terahertz spectral range. There are inherent material and geometric limitations that exist for terahertz waveguides. It is therefore important to optimize the design to enable their use in applications efficiently. This thesis investigates the characteristics of three primary terahertz waveguides based on the underlying theory and results obtained from simulations. The three waveguides are parallel-plate waveguides, two-wire waveguides, and coplanar striplines. The work in this thesis mostly focuses on coplanar striplines, optimal for building a highly efficient commercial and portable terahertz system-on-chip (TSOC). The contribution of the thesis is around the use of different types of passive components mounted on a thin commercial Silicon Nitride membrane. A bias tee is introduced which is a combination of interdigitated electrodes and a meander inductor. The length of the interdigitated electrodes and the gap between them are 55 um and 5 um, respectively. The S21 parameter for this structure ranges from -24 dB/mm at near-zero frequencies to -0.8 dB/mm at 1 THz. This indicates that the designed bias tee can appropriately block low frequencies. Split-ring resonators are also used to act as band-stop filters. The resonant frequency of the resonator depends on the radii of the split-rings. In the optimized design, the internal radius of the outer ring is 25 um and the external radius of the inner ring is 20 um. This results in a narrowband band-stop filter with its resonant frequency centered at 701 GHz. The optimized final TSOC design discussed in this work uses these passive components placed on the Silicon Nitride membrane and is shown to have a total loss that is 3 dB/mm less than any of the previous work for terahertz frequencies. Graduate 2020-09-02T04:13:01Z 2020-09-02T04:13:01Z 2020 2020-09-01 Thesis http://hdl.handle.net/1828/12090 English en Available to the World Wide Web application/pdf |
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Terahertz waveguide On-chip-system Low loss |
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Terahertz waveguide On-chip-system Low loss Shiran, Vahid Design and optimization of terahertz waveguides with low loss and dispersion |
description |
Electromagnetic waves in the terahertz spectral range have gained significant research focus due to their applications in various fields of science. To effectively
generate and integrate terahertz waves in systems, appropriate waveguide
design is critical. Conventionally waveguides have been used to control the propagation
of electromagnetic waves. A waveguide with low loss and dispersion is always
preferred. But achieving these characteristics is quite challenging especially if operating
in the terahertz spectral range. There are inherent material and geometric
limitations that exist for terahertz waveguides. It is therefore important to optimize
the design to enable their use in applications efficiently. This thesis investigates the characteristics of three primary terahertz waveguides
based on the underlying theory and results obtained from simulations. The three
waveguides are parallel-plate waveguides, two-wire waveguides, and coplanar striplines.
The work in this thesis mostly focuses on coplanar striplines, optimal for building a
highly efficient commercial and portable terahertz system-on-chip (TSOC). The contribution of the thesis is around the use of different types of passive components
mounted on a thin commercial Silicon Nitride membrane. A bias tee is introduced
which is a combination of interdigitated electrodes and a meander inductor.
The length of the interdigitated electrodes and the gap between them are 55 um and
5 um, respectively. The S21 parameter for this structure ranges from -24 dB/mm at
near-zero frequencies to -0.8 dB/mm at 1 THz. This indicates that the designed bias
tee can appropriately block low frequencies. Split-ring resonators are also used to act
as band-stop filters. The resonant frequency of the resonator depends on the radii of
the split-rings. In the optimized design, the internal radius of the outer ring is 25 um
and the external radius of the inner ring is 20 um. This results in a narrowband
band-stop filter with its resonant frequency centered at 701 GHz. The optimized
final TSOC design discussed in this work uses these passive components placed on
the Silicon Nitride membrane and is shown to have a total loss that is 3 dB/mm less
than any of the previous work for terahertz frequencies. === Graduate |
author2 |
Darcie, Thomas Edward |
author_facet |
Darcie, Thomas Edward Shiran, Vahid |
author |
Shiran, Vahid |
author_sort |
Shiran, Vahid |
title |
Design and optimization of terahertz waveguides with low loss and dispersion |
title_short |
Design and optimization of terahertz waveguides with low loss and dispersion |
title_full |
Design and optimization of terahertz waveguides with low loss and dispersion |
title_fullStr |
Design and optimization of terahertz waveguides with low loss and dispersion |
title_full_unstemmed |
Design and optimization of terahertz waveguides with low loss and dispersion |
title_sort |
design and optimization of terahertz waveguides with low loss and dispersion |
publishDate |
2020 |
url |
http://hdl.handle.net/1828/12090 |
work_keys_str_mv |
AT shiranvahid designandoptimizationofterahertzwaveguideswithlowlossanddispersion |
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1719339276934578176 |