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Electrical and Computer Engineering Faculty Research & Creative Works
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Articles 1 - 30 of 58
Full-Text Articles in Engineering
Recent Development Of Surface Integral Equation Solvers For Multiscale Interconnects And Circuits, Sheng Sun, Lijun Jiang, Weng Cho Chew
Recent Development Of Surface Integral Equation Solvers For Multiscale Interconnects And Circuits, Sheng Sun, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a brief review and recent development of surface integral equation solvers for multiscale interconnects and circuits modeling. As the future production processes down to 5 nm and the operating frequency increases, both multi-scale and large-scale natures should be taken into account in the electromagnetic simulations. Fast, efficient, stable, and broadband integral equation based solvers become indispensable when millions or ten s of millions of unknowns might be involved in the simulation of the integrated circuit. Recent progress and our latest researches in the development of broadband fast electromagnetic solvers will be demonstrated. © 2013 IEEE.
Full-Quantum Simulation Of P-Type Junctionless Transistors With Multi-Band K · P Model, Jun Z. Huang, Weng Cho Chew, Li (Lijun) Jun Jiang, Jie Peng, Chi Yung Yam, Guan Hua Chen
Full-Quantum Simulation Of P-Type Junctionless Transistors With Multi-Band K · P Model, Jun Z. Huang, Weng Cho Chew, Li (Lijun) Jun Jiang, Jie Peng, Chi Yung Yam, Guan Hua Chen
Electrical and Computer Engineering Faculty Research & Creative Works
By adopting a model order reduction technique, we have successfully constructed a program for efficient simulation of nanowire transistors based on the multi-band k · p model and non-equilibrium Green's function (NEGF) approach. We then study for the first time the influences of various device parameters on the performances of p-type junctionless (JL) transistors and compare them to traditional inversion mode (IM) devices. © 2013 IEEE.
An Efficiently Preconditioned Eigenanalysis Of Inhomogeneously Loaded Rectangular Cavities, Qi I. Dai, Yat Hei Lo, Weng Cho Chew, Li (Lijun) Jun Jiang
An Efficiently Preconditioned Eigenanalysis Of Inhomogeneously Loaded Rectangular Cavities, Qi I. Dai, Yat Hei Lo, Weng Cho Chew, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
In this letter, we demonstrate an efficient preconditioning scheme for the eigenanalysis of inhomogeneously loaded rectangular cavities. Modeling the entire structure with the finite-difference frequency-domain (FDFD) method yields a large sparse eigenvalue problem. The desired interior eigen-spectrum is sought for by Arnoldi iterations with the shift-and-invert operation, where the inversion can only be performed iteratively in large-scale applications. A preconditioner is constructed to speed up the inversion. It can effectively shrink the spectrum of the governing matrix and can be solved for by using fast discrete sine and cosine transforms (DSTs and DCTs). Several numerical examples are included to illustrate …
Fast And Efficient Low-Frequency Algorithms For Multiscale Structure Modeling, Sheng Sun, Zu Hui Ma, Qin S. Liu, Zhi Guo Qian, Lijun Jiang, Weng Cho Chew
Fast And Efficient Low-Frequency Algorithms For Multiscale Structure Modeling, Sheng Sun, Zu Hui Ma, Qin S. Liu, Zhi Guo Qian, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
This paper reviews our recently developed fast and efficient algorithms for multiscale structure modeling. Low-frequency electromagnetic analysis becomes indispensable for multi-scale structures because of the involved minute length-scale compared to wavelength and mid length-scale on the order of wavelength or larger, where wave physics meets circuit physics. We are currently investigating stable low-frequency solutions in solving integral equations without the need for loop-tree decomposition, including the augmented EFIE, equivalence principle based algorithms, and perturbation-based Calderon multiplicative preconditioning methods. © 2013 IEEE.
A Novel Broadband Equivalent Source Reconstruction Method For Broadband Radiators, Ping Li, Li (Lijun) Jun Jiang, Jun Hu, Sheng Sun
A Novel Broadband Equivalent Source Reconstruction Method For Broadband Radiators, Ping Li, Li (Lijun) Jun Jiang, Jun Hu, Sheng Sun
Electrical and Computer Engineering Faculty Research & Creative Works
Traditional equivalent source reconstruction methods are only operating at a single frequency point each time. However, for wide band radiators, their computation cost of the source reconstruction increases linearly with the number of frequency points. In this paper, a wide-band equivalent source reconstruction method (WB-SRM) based on the Neville-type Stoer-Bulirsch (SB) algorithm is developed. Supported by the adaptive frequency sampling (AFS) scheme, the number of required sampling data is significantly reduced, which leads to much better computational efficiency. During the AFS process, three fitting models (FM) are considered: two are 'triangle rules', and another one is 'rhombus rule'. The combination …
Passivization Of Em Peec Solutions In The Frequency And Time Domain, Albert E. Ruehli, Giulio Antonini, Lijun Jiang
Passivization Of Em Peec Solutions In The Frequency And Time Domain, Albert E. Ruehli, Giulio Antonini, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
The stability issues for time domain integral equations is well known and it has been investigated for a long time. In this paper, we pursue an approach for the stabilization and even passivization of the electromagnetic solutions in the time and frequency domain using the PEEC circuit techniques. We aim to enhance the passivity by adding more passivization to the EM solution rather than using a post-processing technique which have to be used in the EM solver is not available. © 2013 IEEE.
Enhanced A-Efie With Calderón Multiplicative Preconditioner, Sheng Sun, Lijun Jiang, Weng Cho Chew
Enhanced A-Efie With Calderón Multiplicative Preconditioner, Sheng Sun, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
In this work, a Calderón multiplicative preconditioner (CMP) is proposed for the augmented electric field integral equation (A-EFIE) to improve the convergence. To avoid the imbalance between the vector potential and the scalar potential in the traditional EFIE, A-EFIE considers both the charge and the current as unknowns. After implementing the appropriate frequency scaling and the enforcement of charge neutrality, its formulation is also stable in the low-frequency regime and applicable for large-scale and complex problems. Instead of using other preconditioners, Calderón preconditioning converts the first kind integral equations into the second kind, thus improving the spectrum of the original …
A Compact Hf/Uhf Dual Band Rfid Tag Antenna, Zi Long Ma, Li (Lijun) Jun Jiang, Jingtian Xi, Terry Tao Ye
A Compact Hf/Uhf Dual Band Rfid Tag Antenna, Zi Long Ma, Li (Lijun) Jun Jiang, Jingtian Xi, Terry Tao Ye
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a novel dual band RFID (radio frequency identification) tag antenna. Two challenges are faced: the compact dimension and the impaired bandwidth due to the couplings between two band structures. A spiral coil is designed to handle the HF (13.56MHz) near field coupling, and a diagonal symmetric design consisting of two meander lines are placed inside the coil for UHF band (915MHz). This structure supports multiple resonance modes around 915MHz to broaden the working bandwidth under the large inductive circumstance from the HF coil. The proposed antenna is easy to adjust by both coarse tuning and fine tuning. …
Modeling Radiated Emissions Through Shielding Boxes Based On The Tangential Electrical Field Samplings Over Openings, Ping Li, Li (Lijun) Jun Jiang
Modeling Radiated Emissions Through Shielding Boxes Based On The Tangential Electrical Field Samplings Over Openings, Ping Li, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
The radiation from radiators such as PCBs inside an enclosed shielding box with ventilation slots is an important issue for electromagnetic compatibility or interference characterizations. In this paper, a two-step process is proposed based on the equivalence principle and the electric field integral equation method to complete the radiation prediction. The tangential electric fields over the slots on shielding boxes are first sampled to be the equivalent magnetic currents radiated from internal PCBs. In the second step, to avoid the computation of complex nonanalytical dyadic Green's functions when the field radiation is computed directly from the equivalent source, the surface …
Three Dimensional Polarization Controllable Electromagnetic Cell, Bo Zhu, Weng Cho Chew, Lijun Jiang
Three Dimensional Polarization Controllable Electromagnetic Cell, Bo Zhu, Weng Cho Chew, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
We demonstrate an electromagnetic (EM) cell that can generate uniform electric field with three dimensional (3D) polarization dynamic control for the EM compatibility/interference (EMC/EMI) testing. 3D orthogonal slotline structures are designed and utilized to build the walls of the EM cell. By feeding the slotlines in phase and terminating them with matching loads, the uniform electric field similar to a standing wave is produced by two slotline modes propagating in opposite directions inside the cell. Microwave switches are integrated into the slotlines so that we can choose the operating slotline dynamically and change its orientation in a 3D manner by …
Chipless Rfid Tags Based On Multiple Band-Rejected Planar Log-Periodic Antennas, Shulabh Gupta, Li (Lijun) Jun Jiang
Chipless Rfid Tags Based On Multiple Band-Rejected Planar Log-Periodic Antennas, Shulabh Gupta, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A passive chipless Radio-frequency identification (RFID) tag is proposed based on the tailorable band-rejection property of the log-periodic (LP) antennas. The proposed tag principle is successfully demonstrated using full-wave simulations, where the absence and presence of the band-rejection in VSWR and thus radiation gain, is shown to carry the bit information. Due to the large number of dipole radiators on the LP aperture, the proposed tag can easily support large number of codes, providing a potential solution for limited number of bits in conventional chipless tags. © 2013 IEEE.
An Enhanced Mixed-Form Fast Multipole Algorithm Using Rotation Methods, Ling Ling Meng, Li (Lijun) Jun Jiang
An Enhanced Mixed-Form Fast Multipole Algorithm Using Rotation Methods, Ling Ling Meng, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, the broadband accuracy of the mixed-form fast multipole algorithm (MF-FMA) is improved by applying rotation techniques. Two kinds of rotation methods are employed respectively. One is the coordinate system rotation technique. The other one is the pseudospectral projection based on fast Fourier transform (FFT). Either of them has certain advantages depending on the number of multipoles. Through rotation, translation matrices become very sparse, which enables us to save the storage as well as the CPU time. Hence, we can increase the number of multipoles in the low frequency regime to shift up the transition region of MF-FMA. …
Co-Simulation Of Distributive And Lumped Systems Using The Discontinuous Galerkin Time Domain Finite Element Method, Ping Li, Li (Lijun) Jun Jiang
Co-Simulation Of Distributive And Lumped Systems Using The Discontinuous Galerkin Time Domain Finite Element Method, Ping Li, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
The signal integrity and power integrity analysis of 3D integrated circuits or other EMC/EMI systems usually separate the lumped circuit modeling and the distributive system modeling. However, due to the high density of integration, it is not proper to separate them in the modeling process anymore. In this paper, a hybrid electromagnetics (EM)-circuit simulator is proposed for incorporating multiport lumped circuit networks through their admittance matrices into the discontinuous Galerkin time-domain finite element method (DGTDFEM). The admittance matrix in the Laplace-domain can be derived analytically or obtained from network parameters such as S-parameters in the frequency domain. To convert frequency …
Reducing Computational Workload Of Electromagnetic Scattered Fields From Electrically Large Quadratic Surface At High Frequency, Yu Mao Wu, Weng Cho Chew, Li (Lijun) Jun Jiang
Reducing Computational Workload Of Electromagnetic Scattered Fields From Electrically Large Quadratic Surface At High Frequency, Yu Mao Wu, Weng Cho Chew, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
We use the numerical steepest descent path (NSDP) method to calculate the highly oscillatory physical optics (PO) scattered fields on electrically large quadratic surfaces. The resultant phase behaviors of PO integrands are elliptic and hyperbolic on parabolic and saddle quadratic patches, respectively. The proposed method relies on deforming the integration path of the PO integral into the NSDPs on the complex plane. Numerical results of the PO scattered fields on these smooth conducting quadratic surfaces illustrate that the proposed NSDP method gains high accuracy while the workload is frequency independent. © 2013 IEEE.
One Dimensional Multiple Periodic Composite Right/Left Handed (Crlh) Structures, Zi Long Ma, Li (Lijun) Jun Jiang, Shulabh Gupta, Wei E.I. Sha
One Dimensional Multiple Periodic Composite Right/Left Handed (Crlh) Structures, Zi Long Ma, Li (Lijun) Jun Jiang, Shulabh Gupta, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
The wave-propagation characteristics in a one-dimensional multiple-periodic (MP) Composite right/left-handed (CRLH) structures is presented, where it is found that an increase in the number of unit cells in each supercell leads to new passbands and stopbands. To understand this phenomenon, the network parameters are employed for the theoretical analysis. Detailed dispersion characteristics and the relation between passbands and sub-periodicities are investigated using both analytical and full-wave results, and the reasons for their emergence is qualitatively discussed. Besides, its application to multi-band leaky-wave radiators is also suggested. © 2013 IEEE.
Limitations On High-Frequency Permeability Of Magnetic Materials, Konstantin N. Rozanov, Marina Koledintseva
Limitations On High-Frequency Permeability Of Magnetic Materials, Konstantin N. Rozanov, Marina Koledintseva
Electrical and Computer Engineering Faculty Research & Creative Works
Engineering of magnetic composites with high microwave permeability is important for EMC/EMI and other applications. One of the challenging problems is to determine constraints on the achievable high-frequency permeability of magnetic composites. The objective of the present paper is to analyze the data available from the literature on the microwave permeability constraints and derive a generalized constraint condition. It is well known that in many practical occasions the actual magnetic frequency dispersion curves differ from the Lorentzian behavior. For these cases, an integral form of the constraint may be useful. Possible applications of the integral constraint are discussed for the …
An Efficient Preconditioning Scheme For Eigenanalysis Of Inhomogeneously Loaded Rectangular Cavities, Qi I. Dai, Yat Hei Lo, Lijun Jiang, Weng Cho Chew
An Efficient Preconditioning Scheme For Eigenanalysis Of Inhomogeneously Loaded Rectangular Cavities, Qi I. Dai, Yat Hei Lo, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
An efficient preconditioning scheme for the eigenanalysis of inhomogeneously loaded rectangular cavities is presented. Such structures are modeled with the finite-difference frequency-domain (FDFD) method, while the desired interior eigen-spectra are sought for by Arnoldi iterations with the shiftand-invert operation. In large scale problems, the inversion can only be performed iteratively. A preconditioner is constructed in order to accelerate the inversion. It can effectively shrink the spectrum of the governing matrix, and can be solved for by using fast discrete sine and cosine transforms (DST's and DCT's). The efficiency of this scheme is demonstrated by several numerical examples. © 2013 IEEE.
A New Coulomb Gauge Based Electric Field Integral Equation Method, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Wei E.I. Sha, Yat Hei Lo
A New Coulomb Gauge Based Electric Field Integral Equation Method, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Wei E.I. Sha, Yat Hei Lo
Electrical and Computer Engineering Faculty Research & Creative Works
The electric field integral equation (EFIE) method is one of the most commonly-adopted computational electromagnetic methods. Its popularity stems from the efficient surface triangulation, excellent numerical precision, and the powerful capability of handling open and complex geometries. However, when the frequency tends to zero, the method-of-moment (MoM) solution of EFIE using the Rao-Wilton-Glisson (RWG) basis functions suffers from the low-frequency breakdown, where the contribution from the vector potential is extremely imbalanced with that from the scalar potential. As a result, the matrix representation of EFIE operator is highly ill-conditioned and cannot be inverted reliably and efficiently. © 2013 IEEE.
Analysis Of The Permeability Spectra Of Spinel Ferrite Composites Using Mixing Rules, Takanori Tsutaoka, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva
Analysis Of The Permeability Spectra Of Spinel Ferrite Composites Using Mixing Rules, Takanori Tsutaoka, Teruhiro Kasagi, Kenichi Hatakeyama, Marina Koledintseva
Electrical and Computer Engineering Faculty Research & Creative Works
Magnetic permeability spectra of composite materials containing spinel ferrites (Ni-Zn or Mn-Zn types) have been studied using a permeability dispersion formula by the numerical analysis. The variation of d.c. permeability and the frequency dispersion parameters due to domain wall and gyromagnetic spin resonances with particle content were evaluated using two mixing rules, Coherent Model Approximation (CMA) and Maxwell-Garnet Approximation (MGA) assuming the isotropic particle shape. The variation of d.c. permeability with particle content for spinel ferrite composite can be predicted by the CMA and MGA using the permeability value of embedded ferrite. The dc susceptibility and resonance frequency of domain …
A Coaxial Cable Fabry-Perot Interferometer For Sensing Applications, Jie Huang, Tao Wang, Lei Hua, Jun Fan, Hai Xiao, Ming Luo
A Coaxial Cable Fabry-Perot Interferometer For Sensing Applications, Jie Huang, Tao Wang, Lei Hua, Jun Fan, Hai Xiao, Ming Luo
Electrical and Computer Engineering Faculty Research & Creative Works
This paper reports a novel coaxial cable Fabry-Perot interferometer for sensing applications. The sensor is fabricated by drilling two holes half-way into a coaxial cable. The device physics was described. The temperature and strain responses of the sensor were tested. The measurement error was calculated and analyzed.
Simulation Of Electromagnetic Waves In The Magnetized Cold Plasma By A Dgfetd Method, Ping Li, Li (Lijun) Jun Jiang
Simulation Of Electromagnetic Waves In The Magnetized Cold Plasma By A Dgfetd Method, Ping Li, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
The properties of electromagnetic waves propagating in magnetized plasma slabs and scattering from plasma coated spheres are investigated using the discontinuous Galerkin finite-element time-domain (DGFETD) method. The magnetized plasma is a kind of gyroelectric anisotropic dispersive medium. This anisotropy must be described by an electric permittivity tensor with both nonzero diagonal and off-diagonal elements. Instead of doing the convolution directly in the time domain, an auxiliary differential equations (ADE) method is employed to represent the constitutive relation. The algorithm is validated by studying the transmission characteristics via electron-composed plasma slabs and radar cross section (RCS) of plasma-coated spheres. All numerical …
Operation-State Monitoring And Energization-Status Identification For Underground Power Cables By Magnetic Field Sensing, Xu Sun, Chun Kit Poon, Geoffrey Chan, Cher Leung Sum, Wing Kin Lee, Lijun Jiang, Philip W.T. Pong
Operation-State Monitoring And Energization-Status Identification For Underground Power Cables By Magnetic Field Sensing, Xu Sun, Chun Kit Poon, Geoffrey Chan, Cher Leung Sum, Wing Kin Lee, Lijun Jiang, Philip W.T. Pong
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a novel nondestructive method based on magnetic field sensing is proposed for underground power cable operation-state monitoring and energization-status identification. The magnetic field distribution of the cable is studied using finite element method (FEM) for the power cable operating in different states, i.e., current-energized state (the cable is energized and carries load current) and voltage-energized state (the cable is energized but carries no load current). This innovative method can reconstruct all the source parameters of the cable based on a set of measured magnetic field values. Stochastic optimization technique is applied to realize the reconstruction based on …
Loop-Tree Free Augmented Equivalence Principle Algorithm For Low-Frequency Problems, Zu Hui Ma, Li (Lijun) Jun Jiang, Weng Cho Chew
Loop-Tree Free Augmented Equivalence Principle Algorithm For Low-Frequency Problems, Zu Hui Ma, Li (Lijun) Jun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
In this article, we describe a newly developed integral equation domain decomposition method for solving complex low frequency electromagnetic problems. This method is based on low frequency augmented equivalence principle algorithm (EPA) with the augmented electric field integral equation (A-EFIE). The A-EFIE provides a stable solution in the low-frequency regime as it includes both charge and current as unknowns to avoid the imbalance between the vector potential and the scalar potential. Based on similar idea, the augmented EPA can suppress the projection error resulting from low-frequency problems of the normal EPA. Combining these two methods, the proposed algorithm can be …
Quantum Computing Circuits, Cheng-Hsiao Wu, Casey Andrew Cain
Quantum Computing Circuits, Cheng-Hsiao Wu, Casey Andrew Cain
Electrical and Computer Engineering Faculty Research & Creative Works
A system for performing digital operations, including a first device configured to transform a digital input into one or more signals, at least one AB ring, the at least one AB ring irreducibly-coupled and configured to include at least three terminals, a second device configured to read a portion of a signal expressed upon two or more of the at least three terminals, and a third device configured to transform the portion of the signal expressed upon two or more of the at least three terminals into a digital output, the third device operationally connected to the second device.
Computational Modeling And Experimental Study On Optical Microresonators Using Optimal Spherical Structure For Chemical Sensing, Hanzheng Wang, Lei Yuan, Jie Huang, Xinwei Lan, Cheol-Woon Kim, Lan Jiang, Hai Xiao
Computational Modeling And Experimental Study On Optical Microresonators Using Optimal Spherical Structure For Chemical Sensing, Hanzheng Wang, Lei Yuan, Jie Huang, Xinwei Lan, Cheol-Woon Kim, Lan Jiang, Hai Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
Chemical sensors based on optical microresonators have been demonstrated highly sensitive by monitoring the refractive index (RI) changes in the surrounding area near the resonator surface. In an optical resonator, the Whispering Gallery Modes (WGMs) with high quality (Q) factor supported by the spherical symmetric structure interacts with the contiguous background through evanescent field. Highly sensitive detection can be realized because of the long lifetime of the photons. The computational models of solid glass microspheres and hollow glass spheres with porous wall (PW-HGM) were established. These two types of microresonators were studied through simulations. The PWHGM resonator was proved as …
Fast And Accurate Multiscale Electromagnetic Modeling Framework: An Overview, W. C. Chew, A. C. Cangellaris, J. Schutt-Aine, H. Braunisch, Z. G. Qian, A. A. Aydiner, K. Aygun, L. (Lijun) J. Jiang, Z. H. Ma, L. L. Meng, M. Naeem
Fast And Accurate Multiscale Electromagnetic Modeling Framework: An Overview, W. C. Chew, A. C. Cangellaris, J. Schutt-Aine, H. Braunisch, Z. G. Qian, A. A. Aydiner, K. Aygun, L. (Lijun) J. Jiang, Z. H. Ma, L. L. Meng, M. Naeem
Electrical and Computer Engineering Faculty Research & Creative Works
We present an overview of challenge problems in electromagnetic modeling of highly complex and multi-scale structures found in 3D IC, SiP, SoC, and electronic packaging necessary for signal integrity assessment. © 2013 IEEE.
Noncontact Operation-State Monitoring Technology Based On Magnetic-Field Sensing For Overhead High-Voltage Transmission Lines, Xu Sun, Qi Huang, Yunhe Hou, Lijun Jiang, Philip W.T. Pong
Noncontact Operation-State Monitoring Technology Based On Magnetic-Field Sensing For Overhead High-Voltage Transmission Lines, Xu Sun, Qi Huang, Yunhe Hou, Lijun Jiang, Philip W.T. Pong
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposed a novel noncontact technology of operation-state monitoring based on magnetic-field sensing for high-voltage transmission lines, which can simultaneously measure both electrical and spatial parameters in real time. This technology was derived from research on the magnetic-field distribution at the ground level when the transmission lines operate in different states, including sagging, galloping, and current imbalance. Two typical models of high-voltage three-phase transmission lines were simulated, and the resulting magnetic fields were calculated. The correlation between the magnetic-field variations and the operation states were analyzed. Based on such correlation, a source reconstruction method was developed to reconstruct the …
Model Order Reduction For Multiband Quantum Transport Simulations And Its Application To P-Type Junctionless Transistors, Jun Z. Huang, Weng Cho Chew, Jie Peng, Chi Yung Yam, Li (Lijun) Jun Jiang, Guan Hua Chen
Model Order Reduction For Multiband Quantum Transport Simulations And Its Application To P-Type Junctionless Transistors, Jun Z. Huang, Weng Cho Chew, Jie Peng, Chi Yung Yam, Li (Lijun) Jun Jiang, Guan Hua Chen
Electrical and Computer Engineering Faculty Research & Creative Works
An efficient method is developed for multiband simulation of quantum transport in nanowire electronic devices within nonequilibrium Green's function formalism. The efficiency relies on a model order reduction technique, which projects the k.p Hamiltonian into a much smaller subspace constructed by sampling the Bloch modes of each cross-section layer. Several sampling approaches are discussed to obtain a minimum and accurate basis with reduced computational overhead. The technique is verified by calculating the valence bands of silicon nanowires (SiNWs) and by solving I-V curves of p-type SiNW transistors. This enables us to study for the first time the performances of large …
Fiber Pigtailed Thin Wall Capillary Coupler For Excitation Of Microsphere Wgm Resonator, Haining Wang, Xinwei Lan, Jie Huang, Lei Yuan, Cheol-Woon Kim, Hai Xiao
Fiber Pigtailed Thin Wall Capillary Coupler For Excitation Of Microsphere Wgm Resonator, Haining Wang, Xinwei Lan, Jie Huang, Lei Yuan, Cheol-Woon Kim, Hai Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we demonstrate a fiber pigtailed thin wall capillary coupler for excitation of Whispering Gallery Modes (WGMs) of microsphere resonators. The coupler is made by fusion-splicing an optical fiber with a capillary tube and consequently etching the capillary wall to a thickness of a few microns. Light is coupled through the peripheral contact between inserted microsphere and the etched capillary wall. The coupling efficiency as a function of the wall thickness was studied experimentally. WGM resonance with a Q-factor of 1.14 x 104 was observed using a borosilicate glass microsphere with a diameter of 71 µm. The …
Microwave Assisted Reconstruction Of Optical Interferograms For Distributed Fiber Optic Sensing, Jie Huang, Lei Hua, Xinwei Lan, Tao Wei, Hai Xiao
Microwave Assisted Reconstruction Of Optical Interferograms For Distributed Fiber Optic Sensing, Jie Huang, Lei Hua, Xinwei Lan, Tao Wei, Hai Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
This paper reports a distributed fiber optic sensing technique through microwave assisted separation and reconstruction of optical interferograms in spectrum domain. The approach involves sending a microwave-modulated optical signal through cascaded fiber optic interferometers. The microwave signal was used to resolve the position and reflectivity of each sensor along the optical fiber. By sweeping the optical wavelength and detecting the modulation signal, the optical spectrum of each sensor can be reconstructed. Three cascaded fiber optic extrinsic Fabry-Perot interferometric sensors were used to prove the concept. Their microwave-reconstructed interferogram matched well with those recorded individually using an optical spectrum analyzer. The …