Perovskite compounds have been studied for decades, but extensive attention was aroused only after the discovery of high-efficiency solar cells. In order to promote further research into the basic physics of perovskite materials for novel designs of high performance optoelectronic devices, Prof. Jiang Tang and Prof. Dehui Li (Huazhong University of Science and Technology, China) are organizing a special issue on halide perovskites: from materials to optoelectronic devices. Submission deadline is March 30, 2020.

Terahertz frequency region has attracted considerable interest, due to its unique nature and promising applications. Many breakthroughs were achieved in the past decades, including high performance sources, sensitive detectors, functional devices, interaction with matters as well as plenty applications. More recently, along with dawn of 6G applications, terahertz science and technology has been paid much more attention than ever before. In order to promote research in the area of Terahertz Science and Applications, Prof. Xinliang Zhang (Huazhong University of Science and Technology, China) and Prof. Xiaojun Wu (Beihang University, China) are planning to produce a special issue on Terahertz Science and Applications. Submission deadline is August 15, 2020.

Biomedical optics is a highly interdisciplinary field where physicists, chemists, biologists, physicians and engineers work together to develop optical principle and tools to solve the problems appearing in biology and medicine. It reveals the mechanism of disease occurrence by optical means, develops new diagnostic and therapeutic methods, and promotes the transformation of medicine and biology. The focus of this issue is to provide an interdisciplinary forum for state-of-the-art developments in both fundamental and technological biophotonics areas including the recent progress and trends in advanced biomedical imaging, sensing, spectroscopy, diagnostics, therapeutics, and instrumentation as well as in the modern field of nano-imaging and nano-sensing. Submission deadline is August 31, 2020.

Optical metasurfaces, composed of planar arrays of sub-wavelength dielectric or metallic structures that collectively mimic the operation of conventional bulk optical elements, have revolutionized the field of optics by their potential in constructing high-efficiency and multi-functional optoelectronic systems with a compact form factor. By engineering the geometry, placement and alignment of its constituent elements, an optical metasurface arbitrarily controls the magnitude, polarization, phase, angular momentum, or dispersion of an incident light. The study of metasurface now spans various multidisciplinary fields in both fundamental research on light-matter interaction, and emerging applications from solid-state LiDAR to compact imaging and spectroscopy devices. To highlight the exciting developments in this field and to promote the diverse applications of metasurfaces, Prof. Cheng Zhang (Huazhong University of Science and Technology, China) and Prof. Din-Ping Tsai (The Hong Kong Polytechnic University, China) are organizing a special issue on Recent Advances in Optical Metasurfaces. Submission deadline is November 15, 2020.