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Title Enhancing THz time-domain spectroscopy sensitivity using metamaterials and near-field approaches
Author Κεραντζόπουλος, Κωνσταντίνος
Thesis advisor Τζωρτζάκης, Στέλιος
Abstract Pesticides are widely used in agriculture to protect crops from pests and diseases, but their use can have harmful effects on human health and the environment. Pesticides can cause acute and chronic health effects, and they can also contaminate soil, water, and air. The detection of pesticide residues in food products is essential to ensure the safety and quality of the food supply. Food products are routinely tested for pesticide residues to ensure they comply with regulatory limits and are safe for human consumption. In this work, we present a method for detecting pesticides in the THz region with the use of metamaterials. THz radiation has the potential to detect pesticides due to its ability to interact with molecular vibrations and rotational transitions in molecules, providing information on their chemical composition. The operating mechanism of the metamaterial is based on the concept of a change in the frequency at which it resonates. When the pesticide molecules come into contact with the metamaterial’s surface, they change the refractive index of the surrounding medium, which causes a shift in the resonance frequency. Using THz spectroscopy, it is possible to detect and identify pesticides by measuring the shift in resonance frequency. Due to a shortage of time, the data are preliminary, despite that, they show promise in the detection and identification of pesticides. Further research is needed to optimize the metamaterial-based sensor’s performance and evaluate its performance under different experimental conditions.
Language English
Issue date 2023-03-31
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
  Type of Work--Graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/8/3/9/metadata-dlib-1678093693-290733-14787.tkl Bookmark and Share
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