Coupling Efficiency Analysis of Different Top Coupling Grating for Quantum Well Infrared Photo-Detector

2013 ◽  
Vol 273 ◽  
pp. 515-518
Author(s):  
Ying Li Yang ◽  
Guo Dong Wang
Keyword(s):  
Quantum Well ◽  
Finite Difference Time Domain ◽  
Lattice Structure ◽  
Hexagonal Lattice ◽  
Coupling Efficiency ◽  
Grating Period ◽  
Efficiency Analysis ◽  
Square Lattice ◽  
Difference Time ◽  
Grating Depth

The relative coupling efficiency of different top coupling grating for quantum well infrared photo-detector is calculated by finite difference time domain algorithms. The relative coupling efficiency respect to the grating parameters, such as, grating period and grating depth is analyzed for both square lattice and hexagonal lattice structure gratings. By comparison, it can be concluded that the optimization grating parameters is differential for different grating structure.

Optimization of Trapezoid Coupling Grating for Long-Wave Quantum Well Infrared Photodetector

2012 ◽  
Vol 571 ◽  
pp. 252-255
Author(s):  
Rui Wang ◽  
Ying Li Yang ◽  
Guo Dong Wang ◽  
Yin Ying Liu
Keyword(s):  
Quantum Well ◽  
Coupling Efficiency ◽  
Grating Period ◽  
Infrared Light ◽  
Duty Ratio ◽  
Infrared Photodetector ◽  
Quantum Well Infrared Photodetector ◽  
Long Wave ◽  
Bottom Width ◽  
Grating Depth

The relative coupling efficiency of trapezoid coupling grating for long-wave quantum well infrared photodetector is calculated by finite difference time domain algorthms. By considering the lateral etching effects in grating fabrication, the relative coupling efficiency with respect to the grating parameters, such as, grating period, grating depth, grating top width and grating bottom width etc, is computed. The calculated results show that the relative coupling efficiency will reach the largest value for the 8.266µm incident infrared light when taking grating period asp=2.55 µm, grating depth as h=0.622 µm , grating top width as d1=1.253µm , grating bottom width as d2=0.626µm , duty ratio as q=0.5 and the ratio of bottom width and top width as α=0.5.

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.

scholarly journals Design of a Curved Shape Photonic Crystal Taper for Highly Efficient Mode Coupling

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 585
Author(s):  
Reyhaneh Jannesari ◽  
Thomas Grille ◽  
Cristina Consani ◽  
Gerald Stocker ◽  
Andreas Tortschanoff ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Hexagonal Lattice ◽  
Coupling Efficiency ◽  
Smooth Transition ◽  
Square Lattice ◽  
Group Index ◽  
Photonic Crystal Waveguide ◽  
Silicon Rods

The design and modeling of a curved shape photonic crystal taper consisting of Si rods integrated with a photonic crystal waveguide are presented. The waveguide is composed of a hexagonal lattice of Si rods and optimized for CO2 sensing based on absorption spectroscopy. We investigated two different approaches to design a taper for a photonic crystal waveguide in a hexagonal lattice of silicon rods. For the first approach (type 1), the taper consists of a square lattice taper followed by a lattice composed of a smooth transition from a square to a hexagonal lattice. In the second approach (type 2), the taper consists of a distorted hexagonal lattice. Different shapes, such as convex, concave, and linear, for the curvature of the taper were considered and investigated. The structure of the taper was improved to enhance the coupling efficiency up to 96% at a short taper length of 25 lattice periods. The finite-difference time-domain (FDTD) technique was used to study the transmission spectrum and the group index. The study proves the improvement of coupling using a curved shape taper. Controlling the group index along the taper could be further improved to enhance the coupling efficiency in a wider spectral range.

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.

Terahertz Characteristics of Two Dimensional Photonic Crystal Cavity Based on 3D Finite-Difference Time-Domain Method

2012 ◽  
Vol 602-604 ◽  
pp. 809-812
Author(s):  
Wen Chao Li ◽  
Tao Tao ◽  
Yu Chao Sun
Keyword(s):  
Photonic Crystal ◽  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Hexagonal Lattice ◽  
Time Domain Method ◽  
Light Confinement ◽  
Domain Method ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

We proposed a photonic crystal(PC) cavity of hexagonal lattice with six air holes of which the radius are different from other cylinders. In the center of this structure, the cavity can be obtained and light confinement is achieved. The Figure of E vs time apparently demonstrates that the light confinement can be observed in ultrafast time. All the Figures in this paper, calculated by 3D finite-difference time-domain method, illuminate that the structure proposed is significant in the field of PC.

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