AUTHOR=Cong Longqing , Valiyaveedu Sreekanth Kandammathe , Shi Jinhui , Zhang Xueqian TITLE=Editorial: Terahertz Radiation: Materials and Applications JOURNAL=Frontiers in Physics VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.671647 DOI=10.3389/fphy.2021.671647 ISSN=2296-424X