Design and simulation of infrared optical logic gates based on Si photonic crystal waveguides for high density photonic integrated circuits

摘要

A novel device based on Silicon photonic crystal waveguides suitable for high density photonic integrated circuits was designed. This device is modeled starting from a previous developed device1, where the main part is consisted of a periodic dielectric multimode waveguide. The novelty of our work is that with our device any basic logic gate function can be achieved, and this is done by precisely calculating the phase differences needed between the input signals in order to obtain the 3-folded image wanted at the output of the multimode waveguide. Another important improvement is that the dimensions of the device are reduced by limiting to three the number of maximum allowed propagating modes in the multimode waveguide. Studying several symmetry lattices and dimensions and calculating the photonic band diagrams, the one which is most suitable for the device is kept.