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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Main Author: Lum, Ying Hong
Other Authors: Ranjan Singh
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2023
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Online Access:https://hdl.handle.net/10356/166417
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Institution: Nanyang Technological University
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spelling 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
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics::Optics and light
spellingShingle Science::Physics::Optics and light
Lum, Ying Hong
Miniaturization of terahertz spectroscopy
description 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
format 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
publisher Nanyang Technological University
publishDate 2023
url https://hdl.handle.net/10356/166417
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