We propose and discuss new effective approach for the detection and identification of substances using a THz TDS. It consists in using a substance emission at high frequencies corresponding to high energy levels relaxation due to cascade mechanism of their excitation under the broadband THz pulse action. The second approach is based on a possibility of observing the absorption frequencies of substance under the frequency up-conversion. To explain a physical mechanism of considered possibilities we make a computer simulation using 1D Maxwell's equations and density matrix formalism.
Vyacheslav A. Trofimov, Irina G. Zakharova, Dmitry Yu. Zagursky, and Svetlana A. Varentsova, "New approach for detection and identification of substances using THz TDS ," Proc. SPIE 10441, Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies, 1044107 (Presented at SPIE Security + Defence: September 11, 2017; Published: 5 October 2017); https://doi.org/10.1117/12.2280531.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon