In this work, a comparative research of biologically active organic molecules in its natural environment using the terahertz (THz) time domain spectroscopy (TDS) and Fourier transform spectroscopy (FTS) systems is carried out. Absorption coefficient and refractive index of Nicotiana tabacum L. leaves containing nicotine, Cannabis sativa L. leaves containing tetrahydrocannabinol, and Humulu lupulus L. leaves containing α-acids, active organic molecules that obtain in natural environment, were measured in broad frequency range from 0.1 to 13 THz at room temperature. In the spectra of absorption coefficient the features were found to be unique for N. tabacum, C. sativa and H. lupulus. Moreover, those features can be exploited for identification of C. sativa sex and N. tabacum origin. The refractive index can be also used to characterize different species.
Mindaugas Karaliūnas, Vytautas Jakštas, Kinan E. Nasser, Rimvydas Venckevičius, Andrzej Urbanowicz, Irmantas Kašalynas, and Gintaras Valušis, "Application of terahertz spectroscopy for characterization of biologically active organic molecules in natural environment," Proc. SPIE 9934, Terahertz Emitters, Receivers, and Applications VII, 99340P (Presented at SPIE Nanoscience + Engineering: August 29, 2016; Published: 26 September 2016); https://doi.org/10.1117/12.2238242.
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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