Guest Editorial——TTA Special Section on Terahertz Materials and Devices

Lying between radio frequency and infrared radiation,terahertz(THz)wave encounters lots of difficulties to produce,detect,transmit,and modulate.Great efforts have been made to construct THz devices,including sources,detectors,switches,modulators,lenses,and filters.However,only moderate progresses have been made in THz generation and detection.Furthermore,the devices and techniques to control and manipulate THz waves are still in its infancy.Therefore,it is still a challenge to date to