All-optical simultaneous XOR-AND operation using 1-D periodic nonlinear material

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tanay Chattopadhyay
Keyword(s):  
Contrast Ratio ◽  
Fdtd Method ◽  
Optical Computing ◽  
Material Model ◽  
Nonlinear Material ◽  
Gate Operation ◽  
Nonlinear Materials ◽  
One Dimensional ◽  
All Optical ◽  
Difference Time

Abstract In this paper, an all-optical XOR-AND gate operation has been proposed using one-dimensional periodic nonlinear material model. This structure consists of alternating layers of different nonlinear materials. In this design, we can obtain XOR and AND logical operation simultaneously at the reflected and transmitted port of the periodic structure. Numerical simulation has also been done using the finite-difference-time-domain (FDTD) method. The response time of this switching operation is picoseconds (ps) range order. We find low insertion loss (−3.01 dB), high contrast ratio (14.13 dB) and high extension ratio (10.93 dB) of this device. This design will be useful in future all-optical computing.

Design and optimization of all-optical demultiplexer using photonic crystals for optical computing applications

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dalai Gowri Sankar Rao ◽  
Mohammed Simran Fathima ◽  
Paila Manjula ◽  
Sandip Swarnakar
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Contrast Ratio ◽  
Optical Computing ◽  
Optical Signal ◽  
Design And Optimization ◽  
Integrated Devices ◽  
All Optical ◽  
Difference Time ◽  
Maximum Transmission

AbstractIn this work, photonic crystal (PhC) based all-optical 1 × 2 demultiplexer is designed for optical computing and optical signal processing. The structure is implemented with two-dimensional PhCs using T-shaped waveguides with an optimized silicon rod radius of 0.2a. Performance of the proposed structure is verified and analyzed by using the finite-difference time-domain method. The design of all-optical demultiplexer is operated based on optical interference effect at a wavelength of 1550 nm. Proposed design occupies less area of 8.4 × 5.4 µm, provides a contrast ratio of 18.53 dB, 94.52% of minimum and 100% of maximum transmission ratio and it has less insertion loss of 0.017 dB; therefore, the proposed device is suitable for photonic integrated devices.

Compact and ultrafast all optical 1-bit comparator based on wave interference and threshold switching methods

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Asghar Askarian
Keyword(s):  
Finite Difference Time Domain ◽  
Contrast Ratio ◽  
Logical Structure ◽  
Ring Resonators ◽  
Plane Wave Expansion ◽  
Threshold Switching ◽  
Wave Interference ◽  
All Optical ◽  
Fdtd Methods ◽  
Difference Time

Abstract In this study, we are going to design all optical 1-bit comparator by combining wave interference and threshold switching methods. The final structure composed of two nonlinear ring resonators and seven waveguides. The functionality of the suggested logical structure is analyzed and simulated by using plane wave expansion (PWE) and finite difference time domain (FDTD) methods. According to results, the proposed all optical 1-bit comparator has faster response and smaller footprint than all previous works. The maximum ON-OFF contrast ratio, delay time and area of the suggested optical comparator are about 16.67 dB, 1.8 ps, and 513 µm2, respectively.

scholarly journals From Time-Collocated to Leapfrog Fundamental Schemes for ADI and CDI FDTD Methods

Axioms ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 23
Author(s):  
Eng Leong Tan
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Unconditionally Stable ◽  
Alternating Direction Implicit ◽  
One Dimensional ◽  
Alternating Direction ◽  
Fdtd Methods ◽  
Difference Time

The leapfrog schemes have been developed for unconditionally stable alternating-direction implicit (ADI) finite-difference time-domain (FDTD) method, and recently the complying-divergence implicit (CDI) FDTD method. In this paper, the formulations from time-collocated to leapfrog fundamental schemes are presented for ADI and CDI FDTD methods. For the ADI FDTD method, the time-collocated fundamental schemes are implemented using implicit E-E and E-H update procedures, which comprise simple and concise right-hand sides (RHS) in their update equations. From the fundamental implicit E-H scheme, the leapfrog ADI FDTD method is formulated in conventional form, whose RHS are simplified into the leapfrog fundamental scheme with reduced operations and improved efficiency. For the CDI FDTD method, the time-collocated fundamental scheme is presented based on locally one-dimensional (LOD) FDTD method with complying divergence. The formulations from time-collocated to leapfrog schemes are provided, which result in the leapfrog fundamental scheme for CDI FDTD method. Based on their fundamental forms, further insights are given into the relations of leapfrog fundamental schemes for ADI and CDI FDTD methods. The time-collocated fundamental schemes require considerably fewer operations than all conventional ADI, LOD and leapfrog ADI FDTD methods, while the leapfrog fundamental schemes for ADI and CDI FDTD methods constitute the most efficient implicit FDTD schemes to date.

Effect of Metal Intercalating on Transmission Characteristics of One-Dimensional Photonic Crystal

2011 ◽  
Vol 418-420 ◽  
pp. 679-683
Author(s):  
Bei Jia He ◽  
Xin Yi Chen ◽  
Jian Bo Wang ◽  
Jun Lu ◽  
Jian Chang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Plasma Frequency ◽  
Fdtd Method ◽  
Transmission Characteristics ◽  
Material Characteristic ◽  
One Dimensional ◽  
Dimensional Photonic Crystal ◽  
Simulation Results ◽  
The One ◽  
Difference Time

To expand the bandgap's width of the one-dimensional photonic crystal, a crystal named SiO2/Metal/MgF2 is formed by joining some metals into the crystal SiO2/MgF2. Furthermore the Finite Difference Time Domain (FDTD) method is used to explore the metals' influence on the crystal's transmission characteristics. The simulation results show that the metals joined could expand the width of the one-dimensional photonic crystal's bandgap effectively and the bandgap's width increases when the metals' thickness increases. Meanwhile the bandgap's characteristic is affected by the metals' material-characteristic. The higher the plasma frequency is, the wider the bandgap's width will be and the more the number of the bandgaps will be. On the other hand, the metals' damping frequency has no significant effect on the bandgap, but would make the bandgap-edge's transmittance decrease slightly.

scholarly journals Non-Standard and Numerov Finite Difference Schemes for Finite Difference Time Domain Method to Solve One- Dimensional Schrödinger Equation

2018 ◽  
Vol 2 (1) ◽  
pp. 27
Author(s):  
Lily Maysari Angraini ◽  
I Wayan Sudiarta
Keyword(s):  
Finite Difference ◽  
Harmonic Oscillator ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Finite Difference Schemes ◽  
Potential Wells ◽  
One Dimensional ◽  
The One ◽  
Difference Time

<span>The purpose of  this paper is to show some improvements of the finite-difference time domain (FDTD) method using Numerov and non-standard finite difference (NSFD) schemes for solving the one-dimensional Schr</span><span>ö</span><span>dinger equation. Starting with results of the unmodified FDTD method, Numerov-FD and NSFD are applied iteratively to produce more accurate results for eigen energies and wavefunctios. Three potential wells, infinite square well, harmonic oscillator and Poschl-Teller, are used to compare results of FDTD calculations. Significant improvements in the results for the infinite square potential and the harmonic oscillator potential are found using Numerov-NSFD scheme, and for Poschl-Teller potential are found using Numerov scheme.</span>

Design and Analysis of 3-Input NAND/NOR/XNOR Gate Based on 2D Photonic Crystals

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
K. Esakki Muthu ◽  
VN. Jannath Ul Firthouse ◽  
S. Sorna Deepa ◽  
A. Sivanantha Raja ◽  
S. Robinson
Keyword(s):  
Integrated Circuits ◽  
Gap Analysis ◽  
Photonic Integrated Circuits ◽  
Fdtd Method ◽  
Plane Wave Expansion ◽  
Square Cavity ◽  
Xnor Gate ◽  
All Optical ◽  
Line Defects ◽  
Difference Time

AbstractIn this paper, Two Dimensional (2D) Photonic Crystal (PhC) based 3-input all optical NOR, NAND and XNOR gates is proposed and designed. The proposed device is formed by the combination of line defects and square cavity. The performance of the device is analyzed using 2D Finite Difference Time Domain (FDTD) method. The band gap analysis is done by Plane Wave Expansion (PWE) method. The device has the lattice constant and refractive index of 616 nm and 3.46, respectively. The dimension of the proposed structure is about 12.5 µm*12 µm which is highly compact and suitable for photonic integrated circuits (PIC).

scholarly journals Tuning Plasmon Induced Reflectance with Hybrid Metasurfaces

Photonics ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 29 ◽  
Author(s):  
Mohsin Habib ◽  
Ekmel Ozbay ◽  
Humeyra Caglayan
Keyword(s):  
Modulation Depth ◽  
Contrast Ratio ◽  
Fdtd Method ◽  
Spectral Contrast ◽  
Design Flexibility ◽  
Different Dimensions ◽  
Control Light ◽  
And Control ◽  
Difference Time ◽  
Total Shift

Electrically tunable metasurfaces with graphene offer design flexibility to efficiently manipulate and control light. These metasurfaces can be used to generate plasmon-induced reflectance (PIR), which can be tuned by electrostatic doping of the graphene layer. We numerically investigated two designs for tunable PIR devices using the finite difference time-domain (FDTD) method. The first design is based on two rectangular antennas of the same size and a disk; in the second design, two parallel rectangular antennas with different dimensions are used. The PIR-effect was achieved by weak hybridization of two bright modes in both devices and tuned by changing the Fermi level of graphene. A total shift of ∼362 nm was observed in the design with the modulation depth of 53% and a spectral contrast ratio of 76%. These tunable PIR devices can be used for tunable enhanced biosensing and switchable systems.

Design of All-optical Half-subtractor Circuit Device using 2-D Principle of Photonic Crystal Waveguides

2019 ◽  
Vol 40 (3) ◽  
pp. 195-203 ◽  
Author(s):  
Sandip Swarnakar ◽  
Santosh Kumar ◽  
Sandeep Sharma
Keyword(s):  
Photonic Crystal ◽  
Integrated Circuits ◽  
Finite Difference Time Domain ◽  
Optical Amplifiers ◽  
Photonic Integrated Circuits ◽  
Square Lattice ◽  
Photonic Crystal Waveguides ◽  
Nonlinear Materials ◽  
All Optical ◽  
Difference Time

Abstract A design of all-optical half-subtractor (AOHS) is presented based on two-dimensional (2-D) photonic crystal (PhC) waveguides without using optical amplifiers and nonlinear materials. It is an essential component of various photonic integrated circuits. The design of AOHS circuit is based on beam interference principle, using square lattice of Y-shaped and T-shaped waveguides with silicon dielectric rods in air substrate. It is validated through finite-difference time-domain and using MATLAB simulations.

Design of One-Bit Magnitude Comparator using Photonic Crystals

2019 ◽  
Vol 40 (4) ◽  
pp. 363-367 ◽  
Author(s):  
Sapna Rathi ◽  
Sandip Swarnakar ◽  
Santosh Kumar
Keyword(s):  
Photonic Crystals ◽  
Finite Difference Time Domain ◽  
Lattice Structure ◽  
Sequential Circuits ◽  
Nonlinear Material ◽  
Time Domain Simulation ◽  
Matlab Simulation ◽  
All Optical ◽  
Combinational And Sequential Circuits ◽  
Difference Time

Abstract At present, photonic crystals (PhCs) are used to design various combinational and sequential circuits. In this paper, an all-optical one-bit magnitude comparator is proposed using PhC waveguide without using nonlinear material. It is based on beam interference principle, using T-shaped lattice with silicon dielectric rods in air background. It is demonstrated through finite-difference time-domain simulation and verified numerically using MATLAB simulation. The size of PhC lattice structure can be as small as 19.167a×19.167a, where ‘a’ is the lattice constant of the PhC.

All-Optical Switching in Ultrashort Photonic Crystal Couplers Modified Y-branch Structure

2015 ◽  
Vol 36 (3) ◽  
Author(s):  
Masoud Zahravi ◽  
Mitra Zahravi ◽  
Hamed Alipour-Banaei
Keyword(s):  
Photonic Crystal ◽  
Optical Switching ◽  
Optical Switch ◽  
Fdtd Method ◽  
Wavelength Division ◽  
All Optical ◽  
Channel Wavelength ◽  
All Optical Switch ◽  
Difference Time ◽  
All Optical Switching

AbstractIn this paper, an all-optical switch based on photonic crystal directional coupler has been simulated and analyzed by the finite difference time domain (FDTD) method. An ultra small 3-channel wavelength division demultiplexer based on 2D photonic crystal was modified into all-optical switch suitable for integration. The output wavelengths of designed structure can be tuned for communication applications (around 1.5 µm, 1.4 µm, 1.3 µm) by locating suitable defect parameters in the corner of each resonance cavity and input waveguides. The bandwidth of each channel is about 1 nm.

Sign in / Sign up

Export Citation Format

Share Document