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The figure depicts a "photonic crystal" promising for the future development of "Li-Fi" technology, which is more advantageous than Wi-Fi and other RF communication systems. Photo Credit: Tal Galfsky, New York City University Light sources that integrate two concepts of artificial optical materials may drive ultra-fast "Li-Fi" communications. In many applications, Li-Fi airborne optical networks may have advantages over Wi-Fi and other radio frequency systems. Li-Fi networks can operate at extremely high speeds; they can operate over a very wide frequency range; they can avoid RF system disturbances, especially in demanding safety environments such as aircraft cockpits and nuclear power plants; they are not easy Hacked. Evgenii Narimanov, a professor of electrical and computer engineering at Purdue University, said that while the range of Li-Fi networks is relatively limited, they do not require line-of-sight operations. He said that today's Li-Fi networks can not fully realize these potential because they lack the right light source. But the design that integrates two concepts of optical materials into "photonic hyperthermia" may fill this gap. Narimanov first proposed this concept in 2014. This month, he and colleagues at the City University of New York reported photon supercrystals in the Proceedings of the National Academy of Sciences (PNAS) with a dramatic increase in photon emissivity and intensity. Narimanov said that photonic super-crystals combine the properties of metamaterials and photonic crystals. "Artificial" optical materials often have properties that do not exist in nature. Metamaterials are produced from man-made structures that are much smaller than the wavelength of light, whereas in photonic crystals the size of "unit cell" is comparable to this wavelength. Although both types of composites often exhibit very different properties, photonic supercrystals combine all of them in the same structure.