Generalized Space-Time-Periodic Diffraction Gratings: Theory and Applications

Unlike a conventional diffraction grating, a space-time-periodic (STP) grating produces spatial diffraction orders, each of which is formed by an infinite set of temporal diffraction orders. STP gratings offer enhanced functionalities and exotic characteristics, such as asymmetric diffraction patterns, nonreciprocal and asymmetric transmission and reflection, and an enhanced diffraction efficiency. Here a rigorous, general theory of diffraction by STP gratings is formulated, and a particular practical application in wireless communication is proposed: an inventive multiple-access communication system, featuring full duplex operation and high data-transmission rate.