Prospects of designing gold-nanoparticles-based soft terahertz radiation sources and terahertz-to-infrared converters for concealed object detection technology

K. A. Moldosanov; A. V. Postnikov; V. M. Lelevkin; N. J. Kairyev

doi:10.1117/12.2532568

18 October 2019 Prospects of designing gold-nanoparticles-based soft terahertz radiation sources and terahertz-to-infrared converters for concealed object detection technology

K. A. Moldosanov, A. V. Postnikov, V. M. Lelevkin, N. J. Kairyev

Author Affiliations +

Proceedings Volume 11164, Millimetre Wave and Terahertz Sensors and Technology XII; 111640B (2019) https://doi.org/10.1117/12.2532568
Event: SPIE Security + Defence, 2019, Strasbourg, France

Abstract

The two-phonon scheme of generation of terahertz (THz) photons by gold nanobars (GNBs) is considered. It is shown that in GNBs, by choosing their sizes, it is possible to provide conditions for converting the energy of longitudinal phonons with THz frequencies into the energy of THz photons. The prospects of designing GNBsbased soft THz radiation sources (frequencies: 0.14; 0.24; 0.41 and 0.70 THz) with a large flow cross-section (diameter ∼ 40 cm) intended for detection of hidden objects under clothing to ensure security in public places (airports, railway stations, stadiums, etc.) are assessed. The choice of the above frequencies is a compromise between the requirements of low absorption of THz radiation by water vapor in air, good penetration through the fabric of clothing, favoring a sufficient resolution of the imaging system, and an abundance of corresponding longitudinal phonons, capable of exciting Fermi electrons in GNBs. Estimates of the characteristics of the terahertz-to-infrared converter based on gold nanospheres (GNSs), which could work in tandem with these sources of THz radiation – as a means of visualization of hidden objects – are also given.

Conference Presentation

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K. A. Moldosanov, A. V. Postnikov, V. M. Lelevkin, and N. J. Kairyev "Prospects of designing gold-nanoparticles-based soft terahertz radiation sources and terahertz-to-infrared converters for concealed object detection technology", Proc. SPIE 11164, Millimetre Wave and Terahertz Sensors and Technology XII, 111640B (18 October 2019); https://doi.org/10.1117/12.2532568

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