SIMULATION AND ANALYSIS OF OPTICAL LOGIC GATES

Abstract

Optical logic gates are designed to perform same functions in optical domain as Boolean logic gates performs in digital domain. The basic gates are OR, NOT and AND. NAND and NOR are universal gates and XOR and XNOR are derived Gates. Here, these gates are implemented in LUMERICAL by using finite difference time domain. The structure consist of a Y shaped cavity in silver film layer which is on the top of silicon dioxide substrate. There are two input ports to provide different input according to amplitude requirement and a single output to obtain the output according to logic function. Here the substrate is made up of SiO2 layer and the signal path has no element the signal is transmitting in Air. The air gap is created in the Ag metal. The range of the simulation is 400 to 700 nm.