Miniaturization of terahertz spectroscopy
The use of terahertz waves in medical research has gained attention in recent years due to the non-ionizing energy levels and non-destructive properties. Despite having promising capabilities comparable to existing medical spectroscopy and imaging techniques, the technology remains confined to resea...
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sg-ntu-dr.10356-1664172023-05-01T15:36:12Z Miniaturization of terahertz spectroscopy Lum, Ying Hong Ranjan Singh School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) ranjans@ntu.edu.sg Science::Physics::Optics and light The use of terahertz waves in medical research has gained attention in recent years due to the non-ionizing energy levels and non-destructive properties. Despite having promising capabilities comparable to existing medical spectroscopy and imaging techniques, the technology remains confined to research settings primarily due to challenges associated with generating and detecting terahertz waves. In this thesis, we document the process building a miniaturized terahertz spectroscopy machine using photoconductive antennas. Due to the complexity of generating and detecting terahertz waves in our fiber-based setup, several challenges had to be addressed before we could observe the first experimental terahertz pulse. Additionally, our apparatus's limitations made it difficult to achieve a high-resolution spectrum and high scan rate simultaneously. To address this, we developed two scan modes using LabVIEW. The absolute scan mode was optimized for resolution of the spectrum and achieved a bandwidth of 1.7 . However, the scan time was long, taking an estimated one hour for a full scan of 660 at 0.05 resolution (13,200 ). On the other hand, the rapid scan mode was designed to optimize scan rate and was able to achieve two scans per second after resolving synchronization issues between delay line movement and data acquisition. However, this mode produced a lower bandwidth of 1.2 due to higher noise levels. Future enhancement to our setup may include downsizing of dimensions, replacing the source meter with an independent power supply unit, integration of a single-board computer, and using a two-tier enclosure to achieve full miniaturization. In addition, dispersion compensating fibers and lock-in detection can be added to optimize the signal. For polarization control, the inclusion of metamaterial is another feature that can be added to the setup. Bachelor of Science in Physics 2023-04-26T05:18:53Z 2023-04-26T05:18:53Z 2023 Final Year Project (FYP) Lum, Y. H. (2023). Miniaturization of terahertz spectroscopy. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/166417 https://hdl.handle.net/10356/166417 en application/pdf Nanyang Technological University |
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Science::Physics::Optics and light Lum, Ying Hong Miniaturization of terahertz spectroscopy |
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The use of terahertz waves in medical research has gained attention in recent years due to the non-ionizing energy levels and non-destructive properties. Despite having promising capabilities comparable to existing medical spectroscopy and imaging techniques, the technology remains confined to research settings primarily due to challenges associated with generating and detecting terahertz waves.
In this thesis, we document the process building a miniaturized terahertz spectroscopy
machine using photoconductive antennas. Due to the complexity of generating and detecting
terahertz waves in our fiber-based setup, several challenges had to be addressed before we
could observe the first experimental terahertz pulse. Additionally, our apparatus's limitations
made it difficult to achieve a high-resolution spectrum and high scan rate simultaneously. To
address this, we developed two scan modes using LabVIEW. The absolute scan mode was
optimized for resolution of the spectrum and achieved a bandwidth of 1.7 . However, the
scan time was long, taking an estimated one hour for a full scan of 660 at 0.05 resolution
(13,200 ). On the other hand, the rapid scan mode was designed to optimize scan rate
and was able to achieve two scans per second after resolving synchronization issues between
delay line movement and data acquisition. However, this mode produced a lower bandwidth
of 1.2 due to higher noise levels.
Future enhancement to our setup may include downsizing of dimensions, replacing the
source meter with an independent power supply unit, integration of a single-board computer,
and using a two-tier enclosure to achieve full miniaturization. In addition, dispersion
compensating fibers and lock-in detection can be added to optimize the signal. For
polarization control, the inclusion of metamaterial is another feature that can be added to
the setup. |
author2 |
Ranjan Singh |
author_facet |
Ranjan Singh Lum, Ying Hong |
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Final Year Project |
author |
Lum, Ying Hong |
author_sort |
Lum, Ying Hong |
title |
Miniaturization of terahertz spectroscopy |
title_short |
Miniaturization of terahertz spectroscopy |
title_full |
Miniaturization of terahertz spectroscopy |
title_fullStr |
Miniaturization of terahertz spectroscopy |
title_full_unstemmed |
Miniaturization of terahertz spectroscopy |
title_sort |
miniaturization of terahertz spectroscopy |
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Nanyang Technological University |
publishDate |
2023 |
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https://hdl.handle.net/10356/166417 |
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1765213863769276416 |