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Ranjan Singh is an Associate Professor at the School of Physical and Mathematical Sciences, Division of Physics and Applied Physics of Nanyang Technological University (NTU), Singapore, since October 2013. He received his B.S. degree in Telecommunications Engineering from Bangalore University in 2001, his M.S. degree in Optoelectronics and Laser Technology from Cochin University of Science and Technology in 2004, and Ph.D. in Photonics from Oklahoma State University in 2009. Before joining NTU, he was a postdoctoral research associate at the Los Alamos National Laboratory from 2009. He is an elected fellow of the Optical Society (OSA) for his pioneering contributions to the field of terahertz science and technology. His current research interest includes terahertz devices for 6G communications, topological photonics, smart sensors, superconductors, ultrafast optics, terahertz time resolved spectroscopy, micro-nano-quantum photo nics, metamaterials, and plasmonics. Editorial