The terahertz research activities have mainly focused on generation and detection until lately, but the focal point has shifted to the practical applications such as high-speed communication, molecular spectroscopy, security imaging, and medical diagnosis, among many others. It is an important task to lay down a common ground among the researchers, so that they can communicate smoothly with one another. This special session aims to bring together researchers from diverse backgrounds to create synergy in this important research area. Topics Sub-wavelength artificial microstructures, Metamaterials, Metasurfaces CW Terahertz Sources and Detectors Terahertz Spectroscopy Intense Terahertz Sources and Applications Terahertz Applications in Biology and Medicine Terahertz Applications in Security and Defense Terahertz Imaging Terahertz Devices, Components and Instruments Terahertz Systems and Antennas Terahertz nonlinearity Terahertz Sensing Terahertz Communications Novel Terahertz Sources Active Means of Manipulating Terahertz Waves Surface Plasmon Polariton Devices and Applications Microstructure Device Fabrication ...