05 تیر 1403
عبدالحميد زاهدي

عبدالحمید زاهدی

مرتبه علمی: استادیار
نشانی: دانشگاه صنعتی کرمانشاه، دانشکده مهندسی برق، گروه مهندسی برق (گرایش های الکترونیک و مخابرات)
تحصیلات: دکترای تخصصی / مهندسی برق مخابرات سیستم
تلفن:
دانشکده: دانشکده مهندسی برق

مشخصات پژوهش

عنوان
Line defects on As2Se3-Chalcogenide photonic crystals for the design of all-optical power splitters and digital logic gates
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Optical splitter Logic gates Photonic crystals Dielectric rods Total internal reflection
پژوهشگران حامد سقایی (نفر اول)، عبدالحمید زاهدی (نفر دوم)، روح الله کریم زاده (نفر سوم)، فریبرز پرندین (نفر چهارم)

چکیده

In this paper, a triangular two-dimensional photonic crystal (PhC) of As2Se3-chalcogenide rods in air is presented and its photonic band diagram is calculated by plane wave method. In this structure, an optical waveguide is obtained by creating a line defect (eliminating rods) in diagonal direction of PhC. Numerical simulations based on finite difference time omain method show that when self-collimated beams undergo total internal reflection at the PhC-air interface, a total reflection of 90 occurs for the output beams. We also demonstrate that by decreasing the radius of As2Se3-chalcogenide instead of eliminating a diagonal line, a two-channel optical splitter will be designed. In this case, incoming selfcollimated beams can be divided into the reflected and transmitted beams with arbitrary power ratio by adjusting the value of their radii. Based on these results, we propose a fourchannel optical splitter using four line defects. The power ratio among output channels can be controlled systematically by varying the radius of rods in the line defects. We also demonstrate that by launching two optical sources with the same intensity and 90 phase difference from both perpendicular faces of the PhC, two logic OR and XOR gates will be achieved at the output channels. These optical devices have some applications in photonic integrated circuits for controlling and steering (managing) the light as desired