Transmission, reflection, refraction and scattering of Terahertz radiation.- Optical constants and dispersion relations in THz spectroscopy.- Scattering effects.- Converging Terahertz beam vs. plane wave.- Signal Processing - Wavelet Transform.- Signal Processing - Fractional Fourier transformation and spectrogram in signal processing of Terahertz pulses.- Terahertz Spectroscopy.- Crystalline and non-crystalline solids.- Liquids and Biomolecules.- Ellipsometry and active polarization control of Terahertz waves.- ATR sensing at terahertz frequencies.- Pump-probe spectroscopy.- Liquid crystals.- Waveguide spectroscopy.- Condensed matter physics.- Assignment of vibrational modes in crystalline materials.- On-chip pulsed Terahertz spectroscopy.- Nonlinear terahertz spectroscopy.- Terahertz Imaging.- Far-field / Near-field.- Biomedical Imaging.- Pharmaceutical imaging.- Terahertz tomography.- Security.- Artists' materials characterization.- Interesting Physics at Terahertz Frequencies.- Plasmonic structures.