Prospects for Terahertz Imaging the Human Skin Cancer with the Help of Gold-Nanoparticles-Based Terahertz-to-Infrared Converter

Postnikov, A. V.; Moldosanov, Kamil A.; Kairyev, N. J.; Lelevkin, V. M.

doi:10.1007/978-94-024-1687-9_9

Cited by 5 publications

(12 citation statements)

References 47 publications

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“…The mismatch in the momentum conservation on such process, that would normally come about due to different dispersion relations for photons, electrons and phonons, will be tolerated by force of the Heisenberg's uncertainty relation, as argued in Ref. 32. Specifically, the confinement-conditioned uncertainty of the electron momentum in a particle of diameter D, ∆p D ≈ h/(2πD), should exceed ∆p F , the mismatch of momentum of the Fermi electron on absorption of the THz photon of frequency ν.…”

Section: Thz To Ir Converter For Visualization Of Hidden Objectsmentioning

confidence: 98%

“…Note that some issues related to improving the efficiency of conversion of THz radiation into heat by nanoobjects were discussed in our article, 25 and issues related to possible methods of manufacturing a matrix from Teflon R were considered in Ref. 32. Since the matrix with embedded GNSs is not commercially available, we mention a method that may be useful in the laboratory conditions.…”

Section: Thz To Ir Converter For Visualization Of Hidden Objectsmentioning

confidence: 99%

“…The use of a Teflon R matrix and application of a standard 2.45 GHz microwave radiation would allow GNBs to be heated to temperatures of about 260 • C. Some matters related to the possible ways of manufacturing the Teflon R matrix were considered in our work. 32 An even greater increase in the temperature of nanobars could be achieved by using for the substrate or matrix such materials as the highresistivity float-zone silicon, crystal quartz, or sapphire. 31…”

Section: Substrate or Matrix With Gold Nanobars For Thz Sourcementioning

confidence: 99%

“…35 More detailed estimations of the expected parameters of this device's performance can be found in Ref. 32.…”

Section: Possible Design Of the Gold-nanobars-based Soft Thz Radiatio...mentioning

confidence: 99%

“…The basic considerations, including estimations of the GNSs diameters, are evoked and discussed in Ref. 32. In a nutshell, on absorbing a THz photon by a GNS, the (presumed nearly free) Fermi electron is excited across m el steps of (confinementimposed) energy ladder, and then relaxed by releasing a longitudinal phonon with n vibr minimal steps in wavevector and/or energy, assuming the linear dispersion for phonons.…”

Section: Thz To Ir Converter For Visualization Of Hidden Objectsmentioning

confidence: 99%

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

Moldosanov

Postnikov

Lelevkin

et al. 2019

Millimetre Wave and Terahertz Sensors and Technology XII

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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 GNBs-based soft THz radiation sources (frequencies: 0.14; 0.24; 0.41 and 0.70 THz) with a large flow crosssection (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.

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Section: Thz To Ir Converter For Visualization Of Hidden Objectsmentioning

confidence: 98%

Section: Thz To Ir Converter For Visualization Of Hidden Objectsmentioning

confidence: 99%

Section: Substrate or Matrix With Gold Nanobars For Thz Sourcementioning

confidence: 99%

“…35 More detailed estimations of the expected parameters of this device's performance can be found in Ref. 32.…”

Section: Possible Design Of the Gold-nanobars-based Soft Thz Radiatio...mentioning

confidence: 99%

Section: Thz To Ir Converter For Visualization Of Hidden Objectsmentioning

confidence: 99%

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

Moldosanov

Postnikov

Lelevkin

et al. 2019

Millimetre Wave and Terahertz Sensors and Technology XII

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Terahertz-to-infrared converters for imaging the human skin cancer: challenges and feasibility

et al. 2023

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Purpose: Terahertz (THz) medical imaging is a promising noninvasive technique for monitoring the skin's conditions, early detection of the human skin cancer, and recovery from burns and wounds. It can be applied for visualization of the healing process directly through clinical dressings and restorative ointments, minimizing the frequency of dressing changes. The THz imaging technique is cost effective, as compared to the magnetic resonance method. Our aim was to develop an approach capable of providing better image resolution than the commercially available THz imaging cameras.Approach: The terahertz-to-infrared (THz-to-IR) converters can visualize the human skin cancer by converting the latter's specific contrast patterns recognizable in THz radiation range into IR patterns, detectable by a standard IR imaging camera. At the core of suggested THz-to-IR converters are flat matrices transparent both in the THz range to be visualized and in the operating range of the IR camera, these matrices contain embedded metal nanoparticles (NPs), which, when irradiated with THz rays, convert the energy of THz photons into heat and become nanosources of IR radiation detectable by an IR camera. Results:The ways of creating the simplest converter, as well as a more complex converter with wider capabilities, are considered. The first converter is a gelatin matrix with gold 8.5-nm diameter NPs, and the second is a polystyrene matrix with 2-nm diameter NPs from copper-nickel MONEL ® alloy 404.Conclusions: An approach with a THz-to-IR converter equipped with an IR camera is promising in that it could provide a better image of oncological pathology than the commercially available THz imaging cameras do.

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Terahertz-to-infrared converter based on the polyvinylchloride matrix with embedded gold nanoparticles

Moldosanov

Bykov

Kairyev

et al. 2021

Emerging Imaging and Sensing Technologies for Security and Defence VI

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Prospects for the development of devices for visualizing terahertz (THz) radiation sources can be associated with the use of the results of old studies (1965)(1966)(1967)(1968)(1969)(1970)(1971)(1972)(1973)(1974)(1975)(1976)(1977)(1978) on the absorption of THz radiation by metal nanoparticles. This "renaissance" demonstrates that metallic nanoparticles can be used as nanotransducers of invisible THz radiation to infrared (IR) radiation detectable by a commercial IR camera. The investigated THz-to-IR converters are matrices that are transparent both in the THz radiation range to be visualized and in the operating range of the IR camera; matrices contain embedded metal nanoparticles. The latter, when irradiated with THz rays, convert the energy of THz photons into heat and become nanosources of IR radiation for the IR camera. In metal nanoparticles, the mechanisms of absorption of THz radiation and its conversion into heat are realized through dissipation of the energy of THz photons due to multiple scattering of electrons, as well as because of excitation of two types of phonons (transverse and longitudinal ones). The conversion of THz energy into the energy of transverse phonons occurs directly, while dissipation and excitation of longitudinal phonons occurs indirectly, through the excitation of Fermi electrons. Polyvinylchloride (PVC) was chosen as the matrix material, and gold nanoparticles were chosen as nanoparticles-fillers.

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Prospects for Terahertz Imaging the Human Skin Cancer with the Help of Gold-Nanoparticles-Based Terahertz-to-Infrared Converter

Cited by 5 publications

References 47 publications

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

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

Terahertz-to-infrared converters for imaging the human skin cancer: challenges and feasibility

Terahertz-to-infrared converter based on the polyvinylchloride matrix with embedded gold nanoparticles

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