scholarly journals 2D Anisotropic Photonic Crystals of Hollow Semiconductor Nanorod with Liquid Crystals

2013 ◽  
Vol 394 ◽  
pp. 38-44
Author(s):  
Filiz Karaomerlioglu ◽  
Sevket Simsek ◽  
Amirullah M. Mamedov ◽  
Ekmel Ozbay
Keyword(s):  
Optical Properties ◽  
Photonic Crystals ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Light Wave ◽  
Fdtd Method ◽  
Two Dimensional ◽  
Plane Wave Expansion ◽  
Control Light ◽  
Difference Time

Photonic crystals (PCs) have many applications in order to control light-wave propagation. A novel type of two-dimensional anisotropic PC is investigated band gap and optical properties as a hollow semiconductor nanorod with nematicliquid crystals (LC). The PC structure composed of an anisotropic nematicLC in semiconductor square hollow nanorod is designed using the plane wave expansion (PWE) method and finite-difference time-domain (FDTD) method. It has been used 5CB (4-pentyl-4`-cyanobiphenyl) as LC core, and Tellurium (Te) as square hollow nanorod material.The PC with hollow Tenanorod with nematicLC is compared with the PC with solid Tenanorodand the PC with hollow Tenanorod.

Research on the transmission coefficient of plasma photonic crystals based on the ICCG–SFDTD method

2015 ◽  
Vol 29 (12) ◽  
pp. 1550052 ◽  
Author(s):  
Ying-Jie Gao ◽  
Hong-Wei Yang ◽  
Rui Weng ◽  
Qing-Xia Niu ◽  
Yu-Jie Liu ◽  
...  
Keyword(s):  
Finite Difference ◽  
Photonic Crystals ◽  
Transmission Coefficient ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Sparse Matrix ◽  
Fdtd Method ◽  
Computational Time ◽  
Plasma Photonic Crystals ◽  
Difference Time

Compared with the traditional finite-difference time-domain (FDTD) method, the symplectic finite-difference time-domain (SFDTD) method has the characteristics of high precision and low dispersion. However, because the higher-order difference is necessary for the calculation, a large sparse matrix is generated. It causes that the computational time is relatively long and the memory is more. To solve this problem, the incomplete Cholesky conjugate gradient (ICCG) method for solving the large sparse matrix needs to be taken into the SFDTD differential equations. The ICCG method can accelerate the iterations of the numerical calculation and reduce the memory with fast and stable convergence speed. The new ICCG–SFDTD method, which has both the advantages of the ICCG method and SFDTD method, is proposed. In this paper, the ICCG–SFDTD method is used for research on the characteristic parameters of the plasma photonic crystals (PPCs) under different conditions, such as the reflection electric field and the transmission coefficient, to verify the feasibility and accuracy of this method. The results prove that the ICCG–SFDTD method is accurate and has some advantages.

An Optical Power Divider Based on Two-dimensional Photonic Crystal Structure

2017 ◽  
Vol 38 (2) ◽  
Author(s):  
Nazanin Mesri ◽  
Hamed Alipour-Banaei
Keyword(s):  
Photonic Crystal ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Optical Power ◽  
Power Divider ◽  
Two Dimensional ◽  
Plane Wave Expansion ◽  
Dimensional Photonic Crystal ◽  
Two Dimensional Photonic Crystal ◽  
Difference Time

AbstractIn this paper, an optical power divider with one input and four outputs has been proposed in a two-dimensional photonic crystal with triangular lattice and simulated using dielectric holes in an air substrate. The dividing properties of the power divider have been numerically simulated and analyzed using the plane wave expansion and finite difference time domain methods. The results show that the transmittance of this divider can be as high as 94.22 % for

scholarly journals Simulation of Optical Properties of Si Photonic Crystals

2014 ◽  
Vol 38 ◽  
pp. 87-98
Author(s):  
K.A.I.L. Wijewardena Gamalath ◽  
W.A.S.C. Settinayake
Keyword(s):  
Optical Properties ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Photonic Crystal Waveguides ◽  
Telecommunication Wavelength ◽  
Set Up ◽  
Difference Time ◽  
Lattice Approach

To investigate optical properties of Si photonic crystal waveguides, a mathematical model was set up. Finite difference time domain method was used to calculate the Maxwell’s equations numerically. For the evolution of the electromagnetic fields in the photonic crystals, simulations were done for a small lattices using Yee lattice approach. The properties of a waveguide and a power divider were investigated for 3λx3λ photonic crystal formed from Si circular rods in air for telecommunication wavelength 1.55 µm. The model developed was satisfactory in predicting the behaviour of light in linear photonic crystals

Optical Properties of Two Malposed Silver Triangular Nanocylinder Arrays

2014 ◽  
Vol 548-549 ◽  
pp. 182-186
Author(s):  
Zheng Jie Cai ◽  
Gui Qiang Liu ◽  
Zheng Qi Liu ◽  
Xiang Nan Zhang ◽  
Ying Hu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Finite Difference ◽  
Surface Plasmons ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Localized Surface Plasmons ◽  
Plasmonic Nanostructure ◽  
Potential Applications ◽  
Difference Time

We propose and theoretically study a novel plasmonic nanostructure composed of two malposed silver (Ag) triangular nanocylinder arrays by the finite-difference time-domain (FDTD) method. The excitation of the localized surface plasmons (LSPs) of the metal triangular nanocylinders, and the strong interaction coupling between LSPs contribute to the enhanced transparency in the visible and near-in region (NIR). The transparency response in the proposed nanostructure is modified by changing the gap distances between two adjacent triangular nanocylinders, and the dielectric environments. The tunable enhanced optical transparency of the proposed nanostructure provides potential applications in sensors and plasmonic filters.

Two-dimensional finite difference-time domain analysis of focus boom noise with velocity disturbance in the atmosphere

2021 ◽  
Vol 263 (6) ◽  
pp. 589-597
Author(s):  
Takao Tsuchiya ◽  
Masashi Kanamori
Keyword(s):  
Finite Difference ◽  
Sound Wave ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Time Domain Analysis ◽  
Two Dimensional ◽  
Supersonic Transport ◽  
Explicit Finite Difference ◽  
Difference Time

In this paper, two-dimensional linear sound wave analysis in the stratified atmosphere with temperature gradient and velocity disturbance is numerically applied to the analysis and prediction of focus boom noise. Focus boom occurs when a supersonic transport accelerates or ascent or descent maneuvers at supersonic speed. Its overpressure is typically more than three times greater than that of a cruise sonic boom. As a result, supersonic transports in future commercial operation are likely to face restrictions on their flight conditions. The compact-explicit finite difference-time domain method is applied to the analysis of two-dimensional linear sound wave propagation. Some numerical experiments are carried out for the case of acceleration. As a result, it is shown that the complex wavefront is accurately analyzed by the FDTD method compared with the ray tracing method. It is also shown that a noise disturbed by velocity disturbance in the atmosphere reaches the ground over a wider area than the focus boom in the no disturbance case.

Sign in / Sign up

Export Citation Format

Share Document