Spurious Absorption Frequency Appearance Due to Frequency Conversion Processes in Pulsed THz TDS Problems.

Vyacheslav A Trofimov, Nan-Nan Wang, Jing-Hui Qiu, Svetlana A Varentsova

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Article in Sensors (Basel, Switzerland), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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4 authors.

Vyacheslav A TrofimovDepartment of Microwave Engineering, Harbin Institute of Technology, Harbin 150001, China.ORCID 0000-0002-0314-6545

Nan-Nan WangDepartment of Microwave Engineering, Harbin Institute of Technology, Harbin 150001, China.

Jing-Hui QiuDepartment of Microwave Engineering, Harbin Institute of Technology, Harbin 150001, China.

Svetlana A VarentsovaFaculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Leninskiye Gory, 119992 Moscow, Russia.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The appearance of the spurious absorption frequencies caused by the frequency conversion process at the broadband THz pulse propagation in a medium is theoretically and experimentally discussed. The spurious absorption frequencies appear due to both the frequency doubling and generation of waves with sum or difference frequency. Such generation might occur because of the nonlinear response of a medium or its non-instantaneous response. This phenomenon is confirmed by the results of a few physical experiments provided with the THz CW signals and broadband THz pulses that are transmitted through the ordinary or dangerous substances. A high correlation between the time-dependent spectral intensities for the basic frequency and generated frequencies is demonstrated while using the computer simulation results. This feature of the frequency conversion might be used for the detection and identification of a substance.

Indexed as

broadband THz pulsedetection and identification of substancefrequency conversionfrequency doublinglinear combination of the absorption frequenciespulsed THz Time-Domain Spectroscopysubstance emissionTHz CW radiation

Identifiers

PMID32230860

DOI10.3390/s20071859

PMCPMC7181264

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