Infrared to terahertz identification of chemical substances used for the production of IEDs

Bratu, A.M.; Bojan, M.; Popa, C.; Petrus, M.

doi:10.1016/j.saa.2024.124055

Cited by 2 publications

(1 citation statement)

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“…THz waves lie between infrared and microwave, in the transition stage from macro electronics to micro photonics. Because THz wave has the characteristics of penetration, security, broadband, transient, coherence and so on, it has aroused great interest in the application of imaging [1][2][3], security [4,5], biomolecular detection [6], chemical process research [7][8][9] and other fields.…”

Section: Introductionmentioning

confidence: 99%

Research of ultra-narrow band filters based on silicon nitride subwavelength grating used in terahertz detection techniques

Wang,

Liu

2024

Phys. Scr.

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As narrow-band pass filters are essential in terahertz(THz) applications, we present a ultra-narrow band filters based on silicon nitride subwavelength grating in this paper. Through rigorous coupled wave analysis, it can be seen that the main role of each structural factor or its influence on the spectral response characteristics are significantly different.Then, according to these laws, we get the design scheme by adjusting the structure factor of the subwavelength grating purposefully and pertinently. It can be seen from the results that the theoretical reflectance at 0.55 THz reaches 99.741%, and the half-peak frequency range is between −171MHz and +53 MHz. At the same time, the low sideband reflectance in the wide frequency band range of 0.2–0.8 THz indicates that the design can be used well for 0.55 THz signal in related THz detection technology.

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