Center for Photonics and Smart Materials

Arish, Egypt

Center for Photonics and Smart Materials

Arish, Egypt
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El-Rabiaey M.A.,Center for Photonics and Smart Materials | Areed N.F.F.,Center for Photonics and Smart Materials | Areed N.F.F.,Mansoura University | Obayya S.S.A.,Center for Photonics and Smart Materials
Journal of Lightwave Technology | Year: 2016

In this paper, compact plasmonic data storage with high-speed sequential writing/reading rate has been proposed and numerically simulated using two-dimensional finite difference time domain method. The proposed storage is composed of a combination of two nematic liquid crystal (NLC) layers and nano-silver sheet perforated with two rectangular nano-holes. The suggested storage has been designed for storing visible light in one of the two nano-holes based on the biasing states of NLC layers. Tuning the dimensions of the proposed storage results in storing three different binary states "01," "10," and "11" with 0.4 power absorption efficiency, 13 dB crosstalk and 1 Gbps sequential writing/reading rate. It is expected that such proposed two-bit binary storage can be used as a basic unit for constructing large scale storage device with high storage capacity and ultra-high bit rate. © 2016 IEEE.


Hameed M.F.O.,Center for Photonics and Smart Materials | Hameed M.F.O.,Mansoura University | Hussain F.F.K.,Al Muthana University | Obayya S.S.A.,Center for Photonics and Smart Materials
Journal of Lightwave Technology | Year: 2017

A novel highly tunable polarization rotator (PR) based on channel waveguide on silicon is introduced and analyzed. The proposed SiO2/Si channel is infiltrated with nematic liquid crystal (NLC) material of type E7. The design parameters of the NLC channel PR have been studied to obtain an efficient polarization conversion with an ultrashort device length. Additionally, a tolerance analysis of the structure geometrical parameters, temperature, and operating wavelength is reported in detail. The modal analysis of the NLC PR is carried out using full-vectorial finite-difference method (FVFDM). Further, the propagation characteristics through the suggested design are obtained using full-vectorial finite-difference beam propagation method (FVFD-BPM). The numerical results reveal that the reported PR of compact device length of 4.02 μm can achieve nearly 100% polarization conversion ratio with insertion loss of 2.19 dB and good crosstalk of -21.73 dB at a wavelength of 1.55 μm. Further, the crosstalk would be better than -20 dB within the wavelength range of 1.55 ± 0.04 μm. Moreover, the polarization conversion ratio can be controlled by applying an external electric field. To the best of the authors' knowledge, it is the first time to introduce ultracompact highly tunable PR based on a channel on silicon platform with simple design and broadband operation. © 1983-2012 IEEE.


Heikal A.M.,Center for Photonics and Smart Materials | Obayya S.S.,Center for Photonics and Smart Materials
Optics InfoBase Conference Papers | Year: 2016

For any photonic device simulation, the accuracy of the numerical solution not only depends on the methods being used but also on the discretization parameters used in that numerical method. The analysis of optical waveguides with strong longitudinal and transverse discontinuities remains a defiance facing numerical techniques. In this work, three innovative methods will be presented to overcome some of the problems facing the traditional methods of modeling photonic devices, especially plasmonics. A new smoothed finite element method (SFEM) is proposed to analyse time domain wave propagation in photonic devices. Moreover, to accurately analyze plasmonic structures with strong discontinuities, a stable Bidirectional Beam Propagation Method (BiBPM) based on Blocked Schur (BS) algorithm is introduced. Finally, an accurate and computationally efficient rational Chebyshev multi-domain pseudo-spectral method (RC-MDPSM) for modal analysis of Photonic devices is presented. The efficiency of the suggested technique stems from using rational Chebyshev basis functions to accurately represent the semi-infinite computational domain; thus, eliminating the use of PML like absorbing boundary conditions. . © OSA 2016.


Heikal A.M.,Center for Photonics and Smart Materials | Heikal A.M.,University of South Wales | Hameed M.F.O.,Center for Photonics and Smart Materials | Hameed M.F.O.,Mansoura University | Obayya S.S.A.,Center for Photonics and Smart Materials
Journal of Lightwave Technology | Year: 2013

In this paper, the modal analysis of a novel design of three trenched single mode channel plasmon polariton is introduced and analyzed using the full-vectorial finite difference method for linear oblique and curved interfaces (FVFD-LOCI). The analyzed parameters are the real effective index, propagation length, and lateral mode radius r3dB. In addition, the figure of merit (FOM) defined as the ratio between propagation length and lateral mode radius is also studied. The analysis is performed for different channel plasmon polariton (CPP) waveguides; trenched-groove, V-groove and the suggested three trenched structure over a specific spectral range (200-550 THz). The selected band of frequency is chosen to ensure the existence of the CPP fundamental mode. The reported design offers very high FOM at low frequency band (200-350 THz) compared to the well known V-groove structure. However, the lateral mode radius r3dB of the suggested three trenched structure is slightly smaller than that of the V-groove structure. For high frequency band (350-550 THz), the FOM is still higher than that of the V-groove structure while the lateral mode radius r3dB is slightly greater than that of the V-groove structure. © 1983-2012 IEEE.


Ayad M.A.,American University in Cairo | Obayya S.S.A.,Center for Photonics and Smart Materials | Swillam M.A.,American University in Cairo
Journal of Lightwave Technology | Year: 2014

A novel design of a submicron power splitter is presented using plasmonics with the metal insulator metal (MIM) configuration. A simple analytical model is utilized to obtain good initial design. The final optimized design is obtained using finite-difference time domain based optimization. The proposed approach provides a simple and efficient methodology for designing 1xN power splitters using MIM configuration. The proposed power splitters are ultra wide band(~ 2 μm) with negligible imbalance. The approach is utilized to design up to 1 × 4, 1 × 8, and 1 × 16 integrated power splitters with submicron footprint, where all the optimized designs are validated. © 1983-2012 IEEE.


Hameed M.F.O.,Mansoura University | Hameed M.F.O.,Center for Photonics and Smart Materials | Obayya S.S.A.,Center for Photonics and Smart Materials
Optics Letters | Year: 2014

In this Letter, an ultra-compact polarization rotator (PR) based on silica photonic crystal fiber with liquid crystal core is introduced and analyzed using full-vectorial finite difference approaches. The analyzed parameters of the suggested PR are the conversion length, modal hybridness, power conversion and crosstalk. In addition, the fabrication tolerance analysis of the reported design is investigated in detail. The proposed PR has an ultra-compact device length of 4.085 μm and an almost 100% polarization conversion ratio. © 2014 Optical Society of America.


Hameed M.F.O.,Center for Photonics and Smart Materials | Hameed M.F.O.,Mansoura University | Heikal A.M.,Center for Photonics and Smart Materials | Heikal A.M.,Mansoura University | And 4 more authors.
Optics Express | Year: 2015

A novel ultra-high tunable photonic crystal fiber (PCF) polarization filter is proposed and analyzed using finite element method. The suggested design has a central hole infiltrated with a nematic liquid crystal (NLC) that offers high tunability with temperature and external electric field. Moreover, the PCF is selectively filled with metal wires into cladding air holes. Results show that the resonance losses and wavelengths are different in x and y polarized directions depending on the rotation angle of the NLC. The reported filter of compact device length 0.5 mm can achieve 600 dB/cm resonance losses at = 90° for x-polarized mode at communication wavelength of 1300 mm with low losses of 0.00751 dB/cm for y-polarized mode. However, resonance losses of 157.71 dB/cm at = 0° can be achieved for y-polarized mode at the same wavelength with low losses of 0.092 dB/cm for x-polarized mode. © 2015 OSA.


Azzam S.I.,Center for Photonics and Smart Materials | Azzam S.I.,Mansoura University | Obayya S.S.A.,Center for Photonics and Smart Materials
Optics Letters | Year: 2015

We investigate the polarization-dependent resonance tunneling effect in silicon waveguides to achieve ultracompact and highly efficient polarization fitters for integrated silicon photonics, to the best of our knowledge for the first time. We hence propose simple structures for silicon-on-insulator transverse electric (TE)-pass and transverse magnetic (TM)-pass polarizers based on the resonance tunneling effect in silicon waveguides. The suggested TE-pass polarizer has insertion losses (IL), extinction ratio (ER), and return losses (RL) of 0.004 dB, 18 dB, and 24 dB, respectively; whereas, the TM-pass polarizer is characterized by IL, ER, and RL of 0.15 dB, 20 dB, and 23 dB, respectively. Both polarizers have an ultra-short device length of only 1.35 and 1.31 μm for the TE-pass and the TM-pass polarizers which are the shortest reported lengths to the best of our knowledge. © 2015 Optical Society of America.


Hameed M.F.O.,Mansoura University | Heikal A.M.,Center for Photonics and Smart Materials | Obayya S.S.A.,Center for Photonics and Smart Materials
IEEE Photonics Technology Letters | Year: 2013

In this letter, a novel design of a passive ultra-compact polarization rotator based on soft glass equiangular spiral photonic crystal fiber (ES-PCF) is proposed and analyzed using full vectorial finite difference approaches. The suggested ES-PCF has eight arms with a central elliptical air hole, which can be shifted in $x$ and $y$ directions to achieve complete polarization conversion. In addition, the major axis of the elliptical hole is rotated by 45°, which offers 99% polarization conversion ratio with ultra-compact device length of 96 μ m. It is also evident from the numerical results that the polarization rotation would be more than 98% over the 1.5-1.6 μm wavelength range. © 1989-2012 IEEE.


Areed N.F.F.,Mansoura University | Obayya S.S.A.,Center for Photonics and Smart Materials
IEEE Photonics Technology Letters | Year: 2013

A novel design of an easily and fully integrated terabit per second (Tbit/s) optical router is presented and analyzed using the finite difference time domain method. The proposed router consists of three photonic bandgap (PBG) waveguides with two nematic liquid crystal (NLC) layers. The suggested device can be used to divert the light beam to one of the three photonic crystal waveguides based on the biasing states of the two NLC layers. In this way, there are three different modes of operation where each one is used for routing data to the required direction. The suggested device offers crosstalk of 19 dB. In addition, the reported structure opens up the revenue for building multi-port optical routers through the use of a number of appropriately positioned NLC layers within the platform of PBG structure. © 1989-2012 IEEE.

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