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Open AccessArticle

All-Optical Ultra-Fast Graphene-Photonic Crystal Switch

1
Department of Electrical Engineering, Shahid Chamran University of Ahvaz, Ahvaz 61357-83135, Iran
2
Electrical Engineering Department, K. N. Toosi University of Technology, Tehran 19697-64499, Iran
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(9), 461; https://doi.org/10.3390/cryst9090461
Received: 30 June 2019 / Revised: 27 August 2019 / Accepted: 28 August 2019 / Published: 3 September 2019
(This article belongs to the Special Issue Sonic and Photonic Crystals)
In this paper, an all-optical photonic crystal-based switch containing a graphene resonant ring has been presented. The structure has been composed of 15 × 15 silicon rods for a fundamental lattice. Then, a resonant ring including 9 thick silicon rods and 24 graphene-SiO2 rods was placed between two waveguides. The thick rods with a radius of 0.41a in the form of a 3 × 3 lattice were placed at the center of the ring. Graphene-SiO2 rods with a radius of 0.2a were assumed around the thick rods. These rods were made of the graphene monolayers which were separated by SiO2 disks. The size of the structure was about 70 µm2 that was more compact than other works. Furthermore, the rise and fall times were obtained by 0.3 ps and 0.4 ps, respectively, which were less than other reports. Besides, the amount of the contrast ratio (the difference between the margin values for logics 1 and 0) for the proposed structure was calculated by about 82%. The correct switching operation, compactness, and ultra-fast response, as well as the high contrast ratio, make the presented switch for optical integrated circuits. View Full-Text
Keywords: graphene; kerr effect; optical switch; photonic band gap; photonic crystal graphene; kerr effect; optical switch; photonic band gap; photonic crystal
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MDPI and ACS Style

Jalali Azizpour, M.R.; Soroosh, M.; Dalvand, N.; Seifi-Kavian, Y. All-Optical Ultra-Fast Graphene-Photonic Crystal Switch. Crystals 2019, 9, 461.

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