Improved design of all-optica half subtractor based 2 - dimensional photonic crystal
Year: 2019
Type: article
Abstract: - Forthcoming Optical computers and Optical Signal Processors need all-optical devices in order to get rid of from Optical-Electrical-Optical conversions; Optical gates play a vital role in Optical networks. Photonic crystals (PhC) are periodic dielectric structures that have a band gap that forbids the propagation of a certain frequency range of light. This property enables one to control light with amazing facility and produce effects that are 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 logical states (Logic ‘0’ and Logic ‘1’) can be condensed by establishing a threshold for output power. If the output power level is more than 0.7µW or less than 0.35µW, then it is regarded as logic ‘1’ and logic ‘0’ respectively. Another advantage is found with its contrast ratio which is about 17.24 dB and 25.88 dB for Difference and Borrow respectively. Compactness and ease of design are the characteristics which makes suitable for Photonic Integrated Circuit (PIC) applications.
Authors: Oraman Yoosefi, A. Rodrı́guez, Nemat Azimi
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3182592467