ABSTRACT
The development of photonic crystal has revolutionized optical electronics. Photonic crystals show significant properties such as the existence of an optical bandgap, which gives very innovative design possibilities for the development of optical components. Optical logic gates are one of the important applications of photonic crystals, which is capable of paving the way to all-optical logic circuits and optical computing. This chapter discusses the interference-based optical logic gates based on photonic crystals. A brief account of bandgap determination by plane wave expansion method is presented, which is essential for the design of logic gates. This is followed by the design principles and conditions of OR, AND, XOR, NOT gates, and so on, and the working is shown with simulations based on the finite difference time domain (FDTD) method.
