Plasmonic Photoconductive Antennas for Terahertz Pulsed Spectroscopy and Imaging Systems

Lavrukhin, D. V.; Galiev, R. R.; Pavlov, Alexey N.; Yachmenev, A. E.; V., None Maytama M.; Glinskiy, I. A.; Хабибуллин, Р. А.; Goncharov, Yu. G.; Zaytsev, Kirill I.; Пономарев, Д. С.

doi:10.1134/s0030400x19050199

Cited by 10 publications

(5 citation statements)

References 42 publications

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“…Being adequately studied and regulated, such a versatile impact of THz waves on living cell opens a variety of THz technology applications in medical therapy of cancers, inflammatory, and neurodegenerative deceases. Finally, we notice that development of such THz therapeutic applications would require further progress in THz components, including highly efficient uncooled CW and pulsed THz emitters, 6 , 7 , 126 – 128 , 130 , 132 – 135 elements of bulk (open space) and fiber/waveguide optics 293 – 299 aimed at the THz-wave delivery to the hardly accessible tissues and internal organs. Such elements are still to be developed.…”

Section: Discussionmentioning

confidence: 99%

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Cellular effects of terahertz waves

et al. 2021

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. Significance: An increasing interest in the area of biological effects at exposure of tissues and cells to the terahertz (THz) radiation is driven by a rapid progress in THz biophotonics, observed during the past decades. Despite the attractiveness of THz technology for medical diagnosis and therapy, there is still quite limited knowledge about safe limits of THz exposure. Different modes of THz exposure of tissues and cells, including continuous-wave versus pulsed radiation, various powers, and number and duration of exposure cycles, ought to be systematically studied. Aim: We provide an overview of recent research results in the area of biological effects at exposure of tissues and cells to THz waves. Approach: We start with a brief overview of general features of the THz-wave–tissue interactions, as well as modern THz emitters, with an emphasis on those that are reliable for studying the biological effects of THz waves. Then, we consider three levels of biological system organization, at which the exposure effects are considered: (i) solutions of biological molecules; (ii) cultures of cells, individual cells, and cell structures; and (iii) entire organs or organisms; special attention is devoted to the cellular level. We distinguish thermal and nonthermal mechanisms of THz-wave–cell interactions and discuss a problem of adequate estimation of the THz biological effects’ specificity. The problem of experimental data reproducibility, caused by rareness of the THz experimental setups and an absence of unitary protocols, is also considered. Results: The summarized data demonstrate the current stage of the research activity and knowledge about the THz exposure on living objects. Conclusions: This review helps the biomedical optics community to summarize up-to-date knowledge in the area of cell exposure to THz radiation, and paves the ways for the development of THz safety standards and THz therapeutic applications.

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Section: Discussionmentioning

confidence: 99%

“…Thereby, as compared with conventional PCA-based THz sources, the above-mentioned hybrid PCAs offer higher optical-to-THz conversion efficiency. 130 , 132 – 135 …”

Section: Modern Thz-wave Emittersmentioning

confidence: 99%

Cellular effects of terahertz waves

et al. 2021

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“…Photoconductive antennas (PCA) are the most commonly used antennas for biomedical imaging in the THz range. A high-resistance thin film of semiconductor materials such as gallium arsenide (GaAs) or zinc oxide (Zno) with two metallic contacts is used to design the PCA [ 7 , 8 ]. Microstrip patch antennas with transparent radiators (consisting of indium tin oxide) and low-resistance materials (such as graphene) are also gaining research interest as a practical alternative to match the coming requirements of the medical healthcare industry [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of an Aperture-Coupled THz Antenna for Diagnosing Breast Cancer

et al. 2023

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The most important technique for exposing early-stage breast cancer is terahertz imaging. It aids in lowering the number of breast cancer-related fatalities and enhancing the quality of life. An essential component of developing the THz imaging system for high-quality photos is choosing the right sensor. In this article, a wideband antenna for microwave imaging of breast tissue with an operating frequency of 30 GHz (107 GHz to 137 GHz) is constructed and analyzed. An aperture-coupled antenna with an optimized ground aperture is proposed and analyzed, which made it possible to obtain better and consistent impedance matching in the wideband spectrum. The variation of backscattered signal energy in body tissue is assessed with healthy breast tissue and in the presence of malignant cells. A significant difference in energy scattering is observed for both situations. The suggested antenna’s linear and stable time domain characteristics make it an appropriate component for THz imaging technology.

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“…To solve the problem of efficiency of conversion of the optical signal into terahertz radiation, a new design based on lush contact electrodes is presented. By reducing the length of the transport path of photocarriers to the contact electrodes of the device [4][5][6][7][8][9]. Due to the inclusion of plasmon contact electrodes in the photoconducting radiators of the large area, most photocarriers are generated near the contact electrodes.…”

Section: Introductionmentioning

confidence: 99%

The Research for Approaches to Increase Power of the Compact THz Emitters Based on Low-Temperature Gallium Arsenide Heterostructures

Nomoev

Васильевский

Виниченко

2020

SSP

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The design and technological conditions for the manufacture of photoconductive antennas based on low-temperature gallium arsenide (LT-GaAs) have been developed. The optimized photoconductive THz antenna is made based on LT-GaAs with the flag geometry of the contacts and with the interdigitated structure including metal closing through the dielectric of each second period. LT-GaAs samples were obtained by molecular beam epitaxy at temperatures of 210 °C, 230 °C, 240 °C on GaAs substrates (100). Dark and photocurrent were measured depending on the bias voltage of the LT-GaAs heterostructure at the EP6 probe station. Full wave finite element method solver has been used to investigate the proposed plasmon PCA electrical and optical behavior by combining the Maxwell's wave equation with the drift-diffusion/Poisson equations.

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Plasmonic Photoconductive Antennas for Terahertz Pulsed Spectroscopy and Imaging Systems

Cited by 10 publications

References 42 publications

Cellular effects of terahertz waves

Cellular effects of terahertz waves

Performance Analysis of an Aperture-Coupled THz Antenna for Diagnosing Breast Cancer

The Research for Approaches to Increase Power of the Compact THz Emitters Based on Low-Temperature Gallium Arsenide Heterostructures

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