scholarly journals Design and Simulation of a Very Fast and Compact All-Optical Full-Subtractor Based an Nonlinear Effect in 2D Photonic Crystals

2021 ◽  
Author(s):  
Reza Beiranvand ◽  
Ali Mir ◽  
Reza Talebzadeh
Keyword(s):  
Refractive Index ◽  
Photonic Crystals ◽  
Integrated Circuits ◽  
Square Lattice ◽  
Optical Integrated Circuits ◽  
All Optical ◽  
Non Linear ◽  
Linear Material ◽  
Silicon Rods ◽  
Doped Glass

Abstract In this paper, by using the non-linear effects and also destructive and constructive interferences between waveguides, we have designed and simulated an all-optical full-Subtractor based on two-dimensional photonic crystals. The proposed Subtractor has a very simple structure which is composed of 33×31 silicon rods immersed in air in a square lattice and involves three input ports (bits) and an additional waveguide to exhaust the unwanted light. We imposed some defect rods to control the behavior of the light. The used non-linear material, is a doped glass with 1.4×10− 14 m2/w non-linear refractive index which is very greater than the non-linearity refractive index of silicon, 3.46×10− 20 m2/w. Since the proposed structure is very simple and compact, it can be applicable in optical integrated circuits and optical calculations.

scholarly journals All-Optical Ultra-Fast Graphene-Photonic Crystal Switch

Crystals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 461 ◽  
Author(s):  
Mohammad Reza Jalali Azizpour ◽  
Mohammad Soroosh ◽  
Narges Dalvand ◽  
Yousef Seifi-Kavian
Keyword(s):  
Photonic Crystal ◽  
Integrated Circuits ◽  
Contrast Ratio ◽  
Fast Response ◽  
High Contrast ◽  
Switching Operation ◽  
Optical Integrated Circuits ◽  
All Optical ◽  
The Difference ◽  
Silicon Rods

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.

Active Photonic Crystals Based multiplexer

2006 ◽  
Vol 934 ◽  
Author(s):  
Principia Dardano ◽  
Vito Mocella ◽  
Luigi Sirleto ◽  
Luigi Moretti ◽  
Ivo Rendina
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Square Lattice ◽  
Two Dimensional ◽  
Optical Effect ◽  
Electro Optical Effect ◽  
Silicon Rods

ABSTRACTIn the last years, in order to achieve active tuning of photonic crystals devices, the possibility to use liquid crystal inside photonic crystals has been explored.On this line of argument, in this paper, we numerically investigate a tunable T-shaped waveguide diplexer, based on a two-dimensional square lattice photonic crystal composed of silicon rods in a liquid crystals. We prove that complete splitting of the entire input wavelengths range in two sub-ranges symmetrical with respect to the middle (switching) wavelength, and propagating in right and left arms respectively, can be achieved. Moreover, changing the refractive index of liquid crystals by electro-optical effect, a tuning of switching wavelength of about 60 nm can be obtained.

scholarly journals Design and Simulation of Linear All-Optical Comparator Based on Square-Lattice Photonic Crystals

2021 ◽  
Author(s):  
Fariborz Parandin ◽  
Reza Kamarian ◽  
Mohamadreza Jomour
Keyword(s):  
Photonic Crystals ◽  
Integrated Circuits ◽  
Photonic Integrated Circuits ◽  
Optical Power ◽  
Logic Circuits ◽  
Logic Circuit ◽  
Square Lattice ◽  
Refractive Indices ◽  
Long Distance ◽  
All Optical

Abstract An optical comparator is an important logic circuit used in digital designs. Photonic crystals are among the platforms for implementing different kinds of gates and logic circuits. Photonic crystals are structures with alternating refractive indices. In digital optics, logical values “0” and “1” are defined based on the level of optical power. In this paper, an optical comparator based on square-lattice photonic crystals is designed and simulated. In the design of this comparator, a small-sized structure is used. The simulation results show that in the proposed comparator, there is a long distance between logical values ​​“0” and “1”. Due to the small size of this comparator and the adequate distance between logical values ​​“0” and “1”, this structure suits photonic integrated circuits with high accuracy.

Photonic Crystal-Based All-Optical Half Adder with High Contrast Ratio

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Priyanka Pathak ◽  
Rukhsar Zafar ◽  
Vinay Kanungo ◽  
Sandeep Vyas
Keyword(s):  
Photonic Crystal ◽  
Integrated Circuits ◽  
Response Time ◽  
Photonic Band Gap ◽  
Contrast Ratio ◽  
Optical Signal ◽  
Square Lattice ◽  
Half Adder ◽  
All Optical ◽  
Silicon Rods

AbstractPhotonic crystal waveguides provide a way to manipulate the performance of an optical signal in an ultra-small volume and are quite viable in designing chip-based components that will work all-optically. Here, in this article an all-optical half adder is proposed. It is based on a square lattice photonic crystal waveguide in which silicon rods are arranged periodically. The photonic crystal offers a wide photonic band-gap in the desired region of telecommunication wavelength (i. e. near λ = 1550 nm. The performance of half Adder is measured using the contrast ratio and response time. The contrast ratio for sum and carry is 5.2 dB and 16.7 dB, respectively. The proposed half adder is miniaturized in size and having a footprint of 49 µm2 only. The total response time of the proposed adder is 1.4 picoseconds only. So, the device offers a high bit rate of 0.714 Tb/sec. The proposed half adder is an optimum choice for its application in on-chip optical integrated circuits.

An all-optical architecture of serial to parallel converter by using Kerr type of non-linear material

2010 ◽  
Vol 39 (3) ◽  
pp. 115-121 ◽  
Author(s):  
Nandita Mitra ◽  
Debajyoti Samanta ◽  
Sourangshu Mukhopadhyay
Keyword(s):  
All Optical ◽  
Non Linear ◽  
Linear Material

2D Square-lattice Photonic Crystal Based on Circular-ring Cylinders and Thin Cross Plates Suitable for Optical Integrated Circuits

2015 ◽  
Vol 44 (4) ◽  
pp. 423002
Author(s):  
王晶晶 WANG Jing-jing ◽  
欧阳征标 OUYANG Zheng-biao ◽  
文国华 WEN Guo-hua ◽  
黄浩 HUANG Hao ◽  
林密 LIN Mi ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Integrated Circuits ◽  
Circular Ring ◽  
Square Lattice ◽  
Optical Integrated Circuits

scholarly journals Fano Resonance in an Asymmetric MIM Waveguide Structure and Its Application in a Refractive Index Nanosensor

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 791 ◽  
Author(s):  
Mengmeng Wang ◽  
Meng Zhang ◽  
Yifei Wang ◽  
Ruijuan Zhao ◽  
Shubin Yan
Keyword(s):  
Refractive Index ◽  
Integrated Circuits ◽  
Fano Resonance ◽  
Structural Parameters ◽  
High Sensitivity ◽  
Split Ring Resonator ◽  
Peak Position ◽  
Optical Integrated Circuits ◽  
Metal Insulator Metal ◽  
Calculation Results

Herein, the design for a tunable plasmonic refractive index nanosensor is presented. The sensor is composed of a metal–insulator–metal waveguide with a baffle and a circular split-ring resonator cavity. Analysis of transmission characteristics of the sensor structures was performed using the finite element method, and the influence of the structure parameters on the sensing characteristics of the sensor is studied in detail. The calculation results show that the structure can realize dual Fano resonance, and the structural parameters of the sensor have different effects on Fano resonance. The peak position and the line shape of the resonance can be adjusted by altering the sensitive parameters. The maximum value of structural sensitivity was found to be 1114.3 nm/RIU, with a figure of merit of 55.71. The results indicate that the proposed structure can be applied to optical integrated circuits, particularly in high sensitivity nanosensors.

Investigative Study of Optical Parameters of Se80.5Bi1.5Te18-yAgy Thin Films

2012 ◽  
Vol 710 ◽  
pp. 739-744 ◽  
Author(s):  
Anup Kumar ◽  
Pawan Heera ◽  
P. B Baraman ◽  
Raman Sharma
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Integrated Circuits ◽  
Band Gap ◽  
Communication Systems ◽  
Optical Band Gap ◽  
Optical Parameters ◽  
Optical Integrated Circuits ◽  
Increase With Increase ◽  
Good Transparency

The optical constants, like absorption coefficient (α), optical band gap (Eg) and refractive index (n), in Se80.5Bi1.5Te18-yAgy (y= 0, 1.0 and1.5) thin films are calculated using well known Swanepoel’s method in the spectral range of 600-2000 nm. The optical band gap has been estimated by using Tauc’s extrapolation method and is found to increase with increase in Ag content. The present results shows that the large value of nonlinear refractive index and good transparency of these thin films will make them a very promising materials for optical integrated circuits in the optical communication systems.

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