All-Optical Half-Adder Circuit Based on Beam Interference Principle of Photonic Crystal

2017 ◽  
Vol 39 (1) ◽  
Author(s):  
Sandip Swarnakar ◽  
Santosh Kumar ◽  
Sandeep Sharma
Keyword(s):  
Integrated Circuits ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Sequential Circuits ◽  
Square Lattice ◽  
Xor Gate ◽  
Half Adder ◽  
All Optical ◽  
Combinational And Sequential Circuits ◽  
Difference Time

AbstractNow a day’s photonic crystals (PhCs) are in trends for designing of various integrated circuits like combinational and sequential circuits. The designing of all-optical half adder circuit based on beam interference principle, using T-shaped square lattice with silica dielectric rods in air background, is proposed. This design is a combination of two structures: one part of it works as AND gate and other part works as XOR gate. This structure is simulated using finite difference time domain (FDTD) method and verified numerically using PWE band solver and also using MATLAB.

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.

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).

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.

PLASMONIC FOCUSING BASED ON CdS NANORIBBON

2010 ◽  
Vol 19 (04) ◽  
pp. 729-735
Author(s):  
ZHEYU FANG ◽  
QI HONG ◽  
CHEN WANG ◽  
XING ZHU
Keyword(s):  
Integrated Circuits ◽  
Finite Difference Time Domain ◽  
Enhancement Factor ◽  
Surface Plasmon Polariton ◽  
Fdtd Method ◽  
Maximum Enhancement ◽  
Optical Integrated Circuits ◽  
Excitation Laser ◽  
Plasmon Polariton ◽  
Difference Time

In this paper, we propose and simulate the surface plasmon polariton nanofocusing process by using Finite-difference Time-domain (FDTD) method. The maximum enhancement factor at the taper end area is optimized with different wavelength of the excitation laser. With the advantage of SNOM, the SPP nanofocusing is experimentally observed by illuminating the tapered CdS nanoribbon deposited on the Ag film. The SPP dispersion is used to predict the optimal taper angles of the structure. As the emission of the focused SPP at the taper end, the proposed plasmonic structure can be severed as a light nanosource emitter in the future optical integrated circuits.

Design of All Optical XOR Gate based on Photonic Crystal Ring Resonator

2019 ◽  
Vol 41 (1) ◽  
pp. 51-56 ◽  
Author(s):  
Sandip Swarnakar ◽  
Sapna Rathi ◽  
Santosh Kumar
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Ring Resonator ◽  
Fdtd Method ◽  
Circular Ring ◽  
Square Lattice ◽  
Optical Logic ◽  
Xor Gate ◽  
All Optical ◽  
Photonic Crystal Ring Resonator

Abstract The photonic crystals (PhC) play an important role in building all optical logic devices and also recommended as solution for opto-electronic bottleneck in terms of speed and size. This paper put forward a design of XOR gate using Photonic Crystal Ring Resonator (PCRR). The ring resonator is a device which provides output on the basis of coupling of mode fields from a linear waveguide to circular ring. The proposed work is designed using two-dimensional (2D) square lattice photonic crystals within the dimensions of $\left( {37a \times 37a} \right)$ by putting silicon (Si) rods in silica (SiO2). The study of device is carried out using finite-difference-time-domain (FDTD) method and verified using MATLAB.

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 A novel proposal based on 2D linear resonant cavity photonic crystals for all-optical NOT, XOR and XNOR logic gates

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Kouddad Elhachemi ◽  
Naoum Rafah
Keyword(s):  
Finite Difference Time Domain ◽  
Resonant Cavity ◽  
Logic Gates ◽  
Low Power Consumption ◽  
Plane Wave Expansion ◽  
Novel Structure ◽  
All Optical ◽  
Easy Integration ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

AbstractIn this paper, we are going to propose a novel structure of all-optical NOT, XOR and XNOR logic gates are presented using a two-dimensional photonic crystal (2D-PhC). This structure is optimized by varying the radius of the cavity, to obtain a quality factor Q = 1192, and also has several ports of entry and one port of output. The size of each structure is equal to 85.8 μm2. The contrast ratios for the structures proposed all-optical NOT, XOR and XNOR logic gates between levels “0” and “1” are, respectively, 25.08, 25.03, and 14.47 dB. The response time for the three logical gates is 8.33 ps, and the bit rate is calculated at about 0.12 Tbit/s, all simulations are based on both numerical methods such as finite difference time domain (FDTD) and plane wave expansion (PWE). Designed logic gates are characterized by low power consumption, compactness and easy integration.

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