Abstract. In recent years, the increasing threat of plastic explosives has posed significant challenges to aviation security agencies, emphasizing the critical need for their timely detection and neutralization. Simultaneously, interest in the terahertz region of the electromagnetic spectrum has grown considerably. This study investigates the potential of terahertz time-domain spectroscopy (THz-TDS) for detecting the spectral signatures of concealed plastic explosives and their compounds. Additionally, the article presents the conceptual design of a terahertz spectrometer specifically developed for identifying concealed hazardous substances.

Кey words: aviation security, terahertz spectrometer, femtosecond laser, GaSe, InSe crystals, plastic explosives, HMX, RDX, TNT