Paper Details

Forthcoming Optical computers and Optical Signal Processors need all-optical devices in order to getrid of from Optical-Electrical-Optical conversions; Optical gates play a vital role in Optical networks. Photoniccrystals (PhC) are periodic dielectric structures that have a band gap that forbids the propagation of a certainfrequency range of light. This property enables one to control light with amazing facility and produce effects thatare impossible with conventional optics and its dielectric constant can be varied occasionally. In this paper,Photonic crystal based Optical Half Subtractor on hexagonal lattice pattern with circle shaped rods is proposed.The Half Subtractor enactment can be upgraded by providing proper distinct space in output power between ‘0’ and‘1’ logical states and operate well even in the reduced input power level. Errors during the identification of logicalstates (Logic ‘0’ and Logic ‘1’) can be condensed by establishing a threshold for output power. If the output powerlevel is more than 0.7μW or less than 0.35μW, then it is regarded as logic ‘1’ and logic ‘0’ respectively. Anotheradvantage is found with its contrast ratio which is about 17.24 dB and 25.88 dB for Difference and Borrowrespectively. Compactness and ease of design are the characteristics which makes suitable for Photonic IntegratedCircuit (PIC) applications.

Oraman Yoosefi, Angel Rodríguez, Nemat Azimi, “IMPROVED DESIGN OF ALL-OPTICA HALF SUBTRACTOR BASED 2 - DIMENSIONAL PHOTONIC CRYSTAL”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 6, Issue 3, pp. 190-199, March 2019.