Low dimensional materials present a kind of systems in which electronic state wave function is confined, at least in one of the three dimensions. However, such materials, possessing quantum size effects, have significantly changed their electronic properties and deeply modified their behaviors when compared with their bulk form. Among these materials, two-dimensional (2D) materials with outstanding optical and physical properties are grabbing worldwide interests followed by the discovery of graphene. Apart from the 2D transition metal dichalcogenides (TMDs), a novel type of elemental 2D materials, such as silicene, arsenene, antimonene, and black phosphorus, is also emerging and revealing potential applications in many fields, including nonlinear optics, ultrafast optics, photovoltaics, plasmonics, photodetectors, and laser.

The aim of this special issue is to summarize the recent advances in new and original theoretical and experimental results in low-dimensional materials (and beyond) for optics, photonics, and optoelectronics.

Potential topics include but are not limited to the following:

• Photovoltaic devices based on low-dimensional materials and beyond (e.g., organic photovoltaics)
• Nonlinear optics and ultrafast optics
• Plasmonics
• Microwave, millimeter-wave, and terahertz devices
• Optical modulators, laser, and photodetectors
• Simulation and experimental observations of the physical properties (optics, electronics, optoelectronics, etc.) of low-dimensional materials and beyond