The International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), is the oldest and largest continuous forum devoted to the science and technology of long-wavelength radiation. This is the 39th Int. Conf. on Infrared, Millimeter, and THz Waves. It covers all scientific and technological activities from millimeter-waves to the THz regime and on to the far-infrared region of the electromagnetic spectrum. The conference brings together scientists and technologists from more than 30 countries and typically hosts 600-700 participants.