排序方式: 共有19条查询结果,搜索用时 15 毫秒
1.
Accurate radial basis function based neural network approach for analysis of photonic crystal fibers
M. F. O. Hameed S. S. A. Obayya K. Al-Begain A. M. Nasr M. I. Abo el Maaty 《Optical and Quantum Electronics》2008,40(11-12):891-905
In this paper, a new and an accurate artificial neural network approach (ANN) is presented for the analysis and design of photonic crystal fibers (PCFs). The new ANN approach is based on the radial basis functions which offer a very quick convergence and high efficiency during the ANN learning. The accuracy of the suggested approach is demonstrated via the excellent agreement between the results obtained using the presented approach and the results of the full vectorial finite difference method (FVFDM). In addition, a new design of highly birefringence PCF with low losses for the two polarized modes is presented using the proposed approach. 相似文献
2.
Nabeil A. Abujnah R. Letizia Mohamed Farhat O. Hameed Maher Abdelrazzak S. S. A. Obayya 《Optical and Quantum Electronics》2013,45(6):503-515
In this paper, slotted microcavity ring resonators based optical storage devices are proposed and analyzed by means of multiresolution time domain technique. The effect of the structure geometrical parameters on the coupling efficiency, normalized transmission spectra and quality factor has been thoroughly investigated and compared to that of the conventional no-slot microring resonator. The suggested slotted configurations increase the quality factor at a fixed gap size between the central ring and input/output waveguides. In addition, the desired compromise between the coupling efficiency and resonance effect inside the ring can be achieved by mere optimization of the slot geometrical characteristics. 相似文献
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In this paper, a 3 × 1 Multiplexer/Demultiplexer (MUX/DEMUX) Photonic Crystal (PhC) based structure is presented. This is
achieved by carefully considering the coupling length of the propagating wave and accurately engineering the geometrical design
of the microcavities. The design is highly selective, such that, a microcavity embedded between two waveguides selects a particular
wavelength to couple from one waveguide into an adjacent waveguide. The numerical technique used for the designs throughout
this paper is the Complex Envelope Alternating Direction Implicit Finite Difference Time Domain (CE-ADI-FDTD). 相似文献
5.
A novel design of Multiplexer–Demultiplexer (MUX–DEMUX) based on index guiding soft glass nematic liquid crystal (NLC) based
photonic crystal fiber coupler is proposed and analyzed. The simulation results are obtained using the full vectorial finite
difference method as well as the full vectorial finite difference beam propagation method. The numerical results reveal that
the proposed MUX–DEMUX of length 3.265 mm can provide low crosstalk better than −20dB with great bandwidths of 40 and 24 nm
around the wavelengths of 1.3 and 1.55 μm, respectively. In addition, the reported MUX–DEMUX has a tolerance of ±3% in its
length which makes the design more robust to the perturbation introduced during the fabrication process. 相似文献
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J. Derbali F. AbdelMalek S. S. A. Obayya H. Bouchriha R. Letizia 《Optical and Quantum Electronics》2011,42(8):463-472
The development of technology in photonic crystal (PC) structures has seen rapid progress. Using PCs in biosensing area may
open new venues to achieve single molecule detection, and high resolution scanning. A novel PC sensor with improved performances,
in terms of size, compactness and sensitivity is presented in this paper. The sensing element consists of dielectric cylinders
with varying radius introduced along <01> and <10> directions of the crystal. The results show that the peak wavelength shifts
to the high frequency region when only six cylinders are filled with analytes. Also, the peaks show a larger shift compared
to the structure obtained using the entire PC waveguide as sensing region. The proposed sensor shows a better sensitivity
to water than other analytes, where the peak wavelength tends to shift towards the low frequency region. 相似文献
8.
Ahmed E. Khalil Ahmed H. El-Saeed Mohamed A. Ibrahim Mohamed E. Hashish Mohammed R. Abdelmonem Mohamed Farhat O. Hameed Mohammad Y. Azab S. S. A. Obayya 《Optical and Quantum Electronics》2018,50(3):158
A highly sensitive surface plasmon resonance photonic crystal fiber (PCF) biosensor based on Titanium Nitride (TiN) as a new alternative plasmonic material is proposed and analyzed. The TiN has high stability, high conductivity, and corrosion resistance which make it an ideal material for nanofabrication. The suggested biosensor is analyzed by full vectorial finite element method with perfectly matched layer as boundary conditions. In this paper, the biosensor geometrical parameters are studied to achieve high sensitivity for both polarized modes. A refractive index sensitivity of 7700 and 3600 nm/RIU for quasi-transverse electric and quasi transverse magnetic modes, respectively, are obtained. Additionally, the reported biosensor could be used for detecting an unknown analyte refractive index ranging from 1.32 to 1.34 with a high linearity. Further, the proposed biosensor structure is easy for fabrication using standard PCF fabrication current technologies. 相似文献
9.
P. Bienstman S. Selleri L. Rosa H. P. Uranus W. C. L. Hopman R. Costa A. Melloni L. C. Andreani J. P. Hugonin P. Lalanne D. Pinto S. S. A. Obayya M. Dems K. Panajotov 《Optical and Quantum Electronics》2006,38(9-11):731-759
We present results from a mode solver comparison held within the frameworkof the European COST P11 project. The structure modelled is a high-index contrast photonic wire in silicon-on- insulator subject to substrate leakage. The methods compared are both in-house developed and commercial, and range from effective index and perturbation methods, over finite-element and finite-difference codes, beam propagation methods, to film mode matching methods and plane wave expansion methods. 相似文献
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We propose and analyze a novel (to the best of our knowledge) design of a polarization rotator (PR) based on silica photonic crystal fiber. The proposed design has a rectangular core region with a slanted sidewall. The simulation results are obtained using the full vectorial finite difference method as well as the full vectorial finite difference beam propagation method. The numerical results reveal that the suggested PR can provide a nearly 100% polarization conversion ratio with a device length of 3102 μm. 相似文献