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Rasoga O, Dragoman D, Dinescu A, Dirdal CA, Zgura I, Nastase F, Baracu AM, Iftimie S, Galca AC. Tuning the infrared resonance of thermal emission from metasurfaces working in near-infrared. Sci Rep 2023; 13:7499. [PMID: 37161016 PMCID: PMC10169807 DOI: 10.1038/s41598-023-34741-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 05/06/2023] [Indexed: 05/11/2023] Open
Abstract
We simulated numerically and demonstrated experimentally that the thermal emittance of a metasurface consisting of an array of rectangular metallic meta-atoms patterned on a layered periodic dielectric structure grown on top of a metallic layer can be tuned by changing several parameters. The resonance frequency, designed to be in the near-infrared spectral region, can be tuned by modifying the number of dielectric periods, and the polarization and incidence angle of the incoming radiation. In addition, the absorbance/emittance value at the resonant wavelength can be tuned by modifying the orientation of meta-atoms with respect to the illumination direction.
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Affiliation(s)
- Oana Rasoga
- National Institute of Materials Physics, 405A Atomistilor Street, 077125, Magurele, Romania.
| | - Daniela Dragoman
- Faculty of Physics, University of Bucharest, 405 Atomistilor Street, P.O. Box MG-11, 077125, Magurele, Romania.
| | - Adrian Dinescu
- National Institute for Research and Development in Microtechnologies-IMT Bucharest, 126A, Erou Iancu Nicolae Street, 077190, Voluntari, Romania
| | | | - Irina Zgura
- National Institute of Materials Physics, 405A Atomistilor Street, 077125, Magurele, Romania
| | - Florin Nastase
- National Institute for Research and Development in Microtechnologies-IMT Bucharest, 126A, Erou Iancu Nicolae Street, 077190, Voluntari, Romania
| | - Angela Mihaela Baracu
- National Institute for Research and Development in Microtechnologies-IMT Bucharest, 126A, Erou Iancu Nicolae Street, 077190, Voluntari, Romania
| | - Sorina Iftimie
- Faculty of Physics, University of Bucharest, 405 Atomistilor Street, P.O. Box MG-11, 077125, Magurele, Romania
| | - Aurelian Catalin Galca
- National Institute of Materials Physics, 405A Atomistilor Street, 077125, Magurele, Romania
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Dreier LB, Kölbl C, Jeuk V, Beleites C, Köhntopp A, Duschek F. Setup and Analysis of a Mid-Infrared Stand-Off System to Detect Traces of Explosives on Fabrics. SENSORS (BASEL, SWITZERLAND) 2022; 22:7839. [PMID: 36298189 PMCID: PMC9607324 DOI: 10.3390/s22207839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/06/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
The increasing number of terrorist attacks within the last decade has demonstrated that taking preventive protective measures is highly important. In addition to existing measures, automated detection systems for fast and reliable explosive detection are required. A sensitive spectroscopic system based on mid-infrared spectroscopy has been developed and applied to explosive samples on different types of fabric under various geometric conditions. Using this system, traces of TNT, RDX, PETN and ammonium nitrate can be detected in less than a second. Various approaches for data pretreatment (wavelength calibration) and subsequent analysis (normalization, removal of atmospheric water absorption lines) are presented and the remaining challenges on the road to a fully automated system, including a robust classification algorithm, are discussed.
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Affiliation(s)
- Lisa B. Dreier
- German Aerospace Center, Institute of Technical Physics, Im Langen Grund 1, 74239 Hardthausen, Germany
| | - Christoph Kölbl
- German Aerospace Center, Institute of Technical Physics, Im Langen Grund 1, 74239 Hardthausen, Germany
| | - Vincent Jeuk
- German Aerospace Center, Institute of Technical Physics, Im Langen Grund 1, 74239 Hardthausen, Germany
| | | | - Anja Köhntopp
- German Aerospace Center, Institute of Technical Physics, Im Langen Grund 1, 74239 Hardthausen, Germany
| | - Frank Duschek
- German Aerospace Center, Institute of Technical Physics, Im Langen Grund 1, 74239 Hardthausen, Germany
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