A5103173150- Photonic and Optical Devices
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Plant Surface Properties and Treatments
- Optical Coatings and Gratings
- Molecular Junctions and Nanostructures
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Graphene research and applications
- Electrohydrodynamics and Fluid Dynamics
- Animal Nutrition and Physiology
- Fluid Dynamics and Heat Transfer
- Livestock and Poultry Management
- Reproductive Physiology in Livestock
- Microgrid Control and Optimization
- Global Energy Security and Policy
- Diamond and Carbon-based Materials Research
- Advanced Measurement and Detection Methods
- Perovskite Materials and Applications
- Electromagnetic Simulation and Numerical Methods
- HVDC Systems and Fault Protection
- Agriculture and Biological Studies
- Microwave and Dielectric Measurement Techniques
University of Toledo
2023
Shantou University Medical College
2023
Shantou University
2023
National Research Council Canada
2019
Polytechnique Montréal
2018-2019
AMO (Germany)
2014-2017
University of Birmingham
2013-2015
American Petroleum Institute
2012
University of the Andes
2011
COMSATS University Islamabad
2005
Optical data links are the backbone of today's telecommunication infrastructure. The integration electronic and optic components on one chip is most attractive routes to further increase system performance. Here, we present fabrication photodetectors based CVD-grown graphene silicon photonic waveguides. devices operate bias-free in C-band at 1550 nm show an extrinsic −3 dB bandwidth 41 GHz. We demonstrate that these detectors work rates up 50 GBit/s with excellent signal integrity.
Graphene is considered a promising material for broadband opto-electronics because of its linear and gapless band structure. Its optical conductivity can be significantly tuned electrostatically by shifting the Fermi level. Using mentioned property, we experimentally demonstrate graphene based electro-absorption modulator with very low insertion loss. The device realized on silicon insulator (SOI) waveguide operating at 1550 nm wavelength. shows modulation depth 16 dB an loss 3.3 dB,...
Abstract Graphene has been considered as a promising material for opto-electronic devices, because of its tunable and wideband optical properties. In this work, we demonstrate electro-refractive phase modulation in graphene at wavelengths from 1530 to 1570 nm. By integrating gated layer silicon-waveguide based Mach-Zehnder interferometer, the key parameters modulator like change effective refractive index, insertion loss absorption are extracted. These experimentally obtained values well...
Thermo-optical tuning of the refractive index is one pivotal operations performed in integrated silicon photonic circuits for thermal stabilization, compensation fabrication tolerances, and implementation operations. Currently, heaters based on metal wires provide temperature control waveguide. The strong interaction light, however, necessitates a certain gap between heater structure to avoid significant transmission loss. Here we present graphene that overcomes this constraint enables an...
Here in this work, we study the electro-refractive modulation of CVD grown single layer graphene placed on top a silicon microring resonator biased using polymer electrolyte gate. A voltage length product for phase shift π, V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">π</sub> L = 2.7 Vmm has been extracted, which is better compared to depletion horizontal and interleaved pn junction type modulators competitive with Silicon-Insulator-Silicon...
Droplet generated from the rupture of a compound liquid jet can be used to produce encapsulated droplets which have applications in wide variety industrial processes. In this paper, we examine instability two dimensional axisymmetric inviscid falling vertically downwards surrounding gas under influence gravity. The steady state equations are derived using an asymptotic method and linear instability, including temporal spatial is determined multiple scales approach. results analysed...
This work reports on the fabrication and characterization of a graphene based variable optical attenuator integrated photonic Si3N4 waveguide operating at 855 nm wavelength. The utilizes gate voltage dependent absorption layer, located in evanescent field waveguide. A maximum attenuation 17 dB is obtained -3 V voltages for device length 700 µm. measured was found to be good agreement with theoretical simulations, taking into account inter- intra-band conductivity graphene. An outlook given...
Compound liquid jets can be used in a variety of industrial applications ranging from capsule production pharmaceutics to enhance printing methods ink-jet printing. An appreciation how instability along compound lead breakup and droplet formation is thus critical many fields science engineering. In this paper, we perform theoretical analysis examine the an axisymmetric inviscid jet which falls vertically under influence gravity. We use long-wavelength, slender-jet asymptotic expansion reduce...
This paper suggests a new mathematical model for Enhanced Oil Recovery (EOR) using Microwaves. It incorporates both the reservoir's physical properties and microwaves (MWs) propagation heating features by considering various designs of powerful MW antenna array horn antenna. A comparative study with conventional EOR method (i.e. steam injection method) reveals that has advantage to provide more concentrated regions interest, leading faster recovery less power energy consumption. The...
In this paper, method of negative moments has been used to estimate the parameter Inverse Rayleigh Distribution. The asymptotic variance estimates obtained. A comparison have made between Maximum Likelihood Estimate and moment first order for
Pakistan ranks top ten countries worst hit by climatic changes, as climate-related events become habitual, these disruptions produce terrain facilitative to theft and vandalism, thereby complicating / intensifying existing challenges trapping the system in vicious circle of clime-security nexus. This paper explores complicated relationship between climate physical security within power transmission sector, a crucial lynchpin energy system. By emphasizing on compounded vulnerabilities arising...
As the efficiency of small-area perovskite solar cells has reached more than 25% in recent years, it is now essential to accelerate commercialization photovoltaics. Developing low-cost, reliable, and automatic large-area coating techniques a crucial step toward industrial production modules. For solution-based deposition films, solvent extraction from wet precursor film critical producing pinhole-free, uniform, high-quality films. Here, we report scalable slot-die method for photovoltaic...
Energy is the basic necessity of modern world and consumption increasing everywhere. Efficient energy supply system backbone for smooth development a country which requires interconnection between different areas countries transmission power over long distances. HVDC one systems can provide efficiently have many advantages technically, economically environmentally HVAC. This why when it comes to distances, would be first discuss study. Although interconnecting frequency AC networks...
We demonstrate a novel grating coupler design based on double asymmetric and vertically oriented waveguide scatterers to efficiently couple normally incident light fundamental mode silicon laying buried oxide layer.
We present a graphene based absorption modulator on SOI waveguide with very low insertion loss. The device showed modulation of 16 dB and an loss only 3.3dB, surpassing GeSi modulators.
We present contact-free THz near-field measurements at large-area graphene covered by an ion gel top-gate. In dependence of the gate-voltage, we map transmission amplitude and resulting sheet resistance distribution across layer. High-resolution access to local charge carrier properties buried enables visualization inhomogeneity defects on a microscopic scale time-dependent evolution based doping process.
We present the experimental demonstration of a compact waveguide-integrated graphene phase modulator marking an essential milestone in outperforming existing silicon based modulators. The results are reproduced by simulations.
The objective of this study was to evaluate the effect eubiotics on intestinal morphology broilers. For purpose, 125 birds were divided into six groups with two replicates each (10 in replicate). Group A given a Basal diet. All except group challenged Salmonella enterica serovar Enteritidis. B provided basal diet, C fed Probiotic-added diet; D Prebiotics-based E essential oils plus and F organic acids Two separate experiments carried out for recovery, checking cecal tonsils conducting an...
Electrical tunability of the optical nonlinearity graphene is demonstrated on a SiN platform using four-wave mixing. The γ graphene-covered waveguide more than doubles when tuning EF to vicinity −ħω/2.
Dissertation, RWTH Aachen University, 2017; Aachen, 1 Online-Ressource (ii, 125 Seiten) : Illustrationen, Diagramme (2017). = 2017