Subwavelength Imaging in Sub-THz Range Using Dielectric Waveguide
Terahertz radiation patterns can be registered using various detectors; however, in most cases, the scanning resolution is limited. Thus, we propose an alternative method for the detailed scanning of terahertz light field distributions after passing simple and complex structures. Our method relies o...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/25/2/336 |
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| author | Paweł Komorowski Przemysław Zagrajek Mateusz Kaluza Andrzej Kołodziejczyk Sławomir Ertman Adrianna Nieradka Mateusz Surma Agnieszka Siemion |
| author_facet | Paweł Komorowski Przemysław Zagrajek Mateusz Kaluza Andrzej Kołodziejczyk Sławomir Ertman Adrianna Nieradka Mateusz Surma Agnieszka Siemion |
| author_sort | Paweł Komorowski |
| collection | DOAJ |
| description | Terahertz radiation patterns can be registered using various detectors; however, in most cases, the scanning resolution is limited. Thus, we propose an alternative method for the detailed scanning of terahertz light field distributions after passing simple and complex structures. Our method relies on using a dielectric waveguide to achieve better sampling resolution. The optical properties of many materials were analyzed using time-domain spectroscopy. A cyclic olefin copolymer (COC) was chosen as one of the most transparent. This study contains a characterization of the losses introduced by the waveguide and a discussion of the setup’s geometry. As a structure introducing the radiation pattern, a 2D quasi-periodic amplitude grating was chosen to observe the Talbot effect (self-imaging). Moreover, some interesting physical phenomena were observed and discussed due to the possibility of detailed scanning, with subwavelength resolution, registering the terahertz wavefront changes behind the structure. |
| format | Article |
| id | doaj-art-ef7942edb0794a6da53480d29f63617d |
| institution | Kabale University |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj-art-ef7942edb0794a6da53480d29f63617d2025-01-24T13:48:33ZengMDPI AGSensors1424-82202025-01-0125233610.3390/s25020336Subwavelength Imaging in Sub-THz Range Using Dielectric WaveguidePaweł Komorowski0Przemysław Zagrajek1Mateusz Kaluza2Andrzej Kołodziejczyk3Sławomir Ertman4Adrianna Nieradka5Mateusz Surma6Agnieszka Siemion7Institute of Optoelectronics, Military University of Technology, gen. S. Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Optoelectronics, Military University of Technology, gen. S. Kaliskiego 2, 00-908 Warsaw, PolandFaculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, PolandFaculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, PolandFaculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, PolandFaculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, PolandFaculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, PolandFaculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, PolandTerahertz radiation patterns can be registered using various detectors; however, in most cases, the scanning resolution is limited. Thus, we propose an alternative method for the detailed scanning of terahertz light field distributions after passing simple and complex structures. Our method relies on using a dielectric waveguide to achieve better sampling resolution. The optical properties of many materials were analyzed using time-domain spectroscopy. A cyclic olefin copolymer (COC) was chosen as one of the most transparent. This study contains a characterization of the losses introduced by the waveguide and a discussion of the setup’s geometry. As a structure introducing the radiation pattern, a 2D quasi-periodic amplitude grating was chosen to observe the Talbot effect (self-imaging). Moreover, some interesting physical phenomena were observed and discussed due to the possibility of detailed scanning, with subwavelength resolution, registering the terahertz wavefront changes behind the structure.https://www.mdpi.com/1424-8220/25/2/336THz radiationself-imagingTalbot effectdielectric waveguides |
| spellingShingle | Paweł Komorowski Przemysław Zagrajek Mateusz Kaluza Andrzej Kołodziejczyk Sławomir Ertman Adrianna Nieradka Mateusz Surma Agnieszka Siemion Subwavelength Imaging in Sub-THz Range Using Dielectric Waveguide Sensors THz radiation self-imaging Talbot effect dielectric waveguides |
| title | Subwavelength Imaging in Sub-THz Range Using Dielectric Waveguide |
| title_full | Subwavelength Imaging in Sub-THz Range Using Dielectric Waveguide |
| title_fullStr | Subwavelength Imaging in Sub-THz Range Using Dielectric Waveguide |
| title_full_unstemmed | Subwavelength Imaging in Sub-THz Range Using Dielectric Waveguide |
| title_short | Subwavelength Imaging in Sub-THz Range Using Dielectric Waveguide |
| title_sort | subwavelength imaging in sub thz range using dielectric waveguide |
| topic | THz radiation self-imaging Talbot effect dielectric waveguides |
| url | https://www.mdpi.com/1424-8220/25/2/336 |
| work_keys_str_mv | AT pawełkomorowski subwavelengthimaginginsubthzrangeusingdielectricwaveguide AT przemysławzagrajek subwavelengthimaginginsubthzrangeusingdielectricwaveguide AT mateuszkaluza subwavelengthimaginginsubthzrangeusingdielectricwaveguide AT andrzejkołodziejczyk subwavelengthimaginginsubthzrangeusingdielectricwaveguide AT sławomirertman subwavelengthimaginginsubthzrangeusingdielectricwaveguide AT adriannanieradka subwavelengthimaginginsubthzrangeusingdielectricwaveguide AT mateuszsurma subwavelengthimaginginsubthzrangeusingdielectricwaveguide AT agnieszkasiemion subwavelengthimaginginsubthzrangeusingdielectricwaveguide |