Wei-Bin Ewe

Institute Of High Performance Computing, Tumasik, Singapore

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Publications (22)25.73 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: This paper presents a compact wideband equivalent- circuit model for electrical modeling of through-silicon vias (TSVs) in 3-D stacked integrated circuits and packaging. Rigorous closed- form formulas for the resistance and inductance of TSVs are de- rived from the magneto-quasi-static theory with a Fourier-Bessel expansion approach, whereas analytical formulas from static solu- tions are used to compute the capacitance and conductance. The equivalent-circuit model can capture the important parasitic ef- fects of TSVs, including the skin effect, proximity effect, lossy ef- fect of silicon, and semiconductor effect. Therefore, it yields accu- rate results comparable to those with 3-D full-wave solvers. Index Terms—Compact wideband equivalent-circuit model, Fourier-Bessel expansion, 3-D integrated circuits (ICs) and pack- aging, through-silicon via (TSV).
    IEEE Transactions on Microwave Theory and Techniques 01/2011; 59(6):1454-1460. · 2.23 Impact Factor
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    ABSTRACT: Multi-physics modeling offers rich opportunities for studying the properties of through-silicon vias (TSV). Results of a TSV study with the theories of electromagnetics, semiconductor physics, and thermal physics are presented. Equivalent circuit models are used to draw together the three different theories to perform the TSV modeling. Moreover, a single TSV is examined for high-speed signal transmission with surface waves. Some pertinent questions are posed regarding multi-physics modeling of TSVs.
    01/2010;
  • Hong-Son Chu, Wei-Bin Ewe, Er-Ping Li
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    ABSTRACT: We numerically show that it is easy to tune, both passively and actively, the transmission power delivered at different output ports of two coupled-bent dielectric-loaded plasmonic waveguides by varying the gap distance and refractive index of driven material between two dielectric stripes. We also investigate the near-field intensity to demonstrate that the power transmitted at different output ports can be varied to realize either equal or unequal levels, depending on the design specifications. A simple expression is proposed to predict the power transmitted to different output ports for a set of given dimensions and refractive index of the driven material.
    Journal of Applied Physics 12/2009; · 2.21 Impact Factor
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    ABSTRACT: We demonstrate how light can be controlled and guided in various dielectric-loaded plasmonic waveguides which consist of a dielectric nanowire suspended above a gold film. The different shapes of the dielectric nanowires on the gold film are characterized by means of the mode profile. Results show that the shapes of nanowires play a significant role on the performance of the waveguides. In addition, the plasmonic wavelength selective device is also discussed which is based on hetero-surface plasmons in layered structures where a hetero-dielectric nanowire is loaded on a metallic film. Our proposed structures can efficiently route and filter the light where the selective wavelength can be tuned by different geometries or refractive indexes of the hetero-dielectric nanowires.
    01/2009;
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    ABSTRACT: In this paper, we study the multiple scattering by electrically small (the radius of the cylinder is much smaller than the wavelength) plasmonic nanocylinders near surface plasmon resonance. The cylinders are assumed to be identical in dimension and composition. The incident plane wave is assumed to be TE polarized so that the plasmon resonance of two-dimensional cylindrical structures (for both individual and group of cylinders) can be excited. It is found that multiple plasmonic cylinders enhance the near-field magnetic field intensity due to mutual coupling. When the electrical dimension q of the cylinders ( q=k<sub>0</sub>R , where k<sub>0</sub> is the wave number of the free space and R is the radius of the cylinder) is fixed, the magnitude of the field distribution primarily depends on the positions of the cylinders at normal incidence.
    Journal of Applied Physics 10/2008; · 2.21 Impact Factor
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    ABSTRACT: The characteristics of plasmonic nano-slot waveguides, in terms of different metallic materials and geometries, are presented in this paper. We numerically investigate how efficiently light can be guided in straight and bend types of metallic waveguide at nanoscale. For numerical simulation the Drude model incorporated finite difference time domain (FDTD) method is used to handle the dispersive nature of the metals such as gold, silver, copper, aluminum at visible and near infra-red (IR) wavelengths. It is demonstrated that the plasmonic waveguide with nano-slot is an efficient candidate for optical interconnects at the visible and near-IR range of electromagnetic spectrum. The performance of straight, 90deg and Z-bend nano-slot waveguides is discussed by means of transmission and near-field characteristics.
    Electromagnetic Compatibility and 19th International Zurich Symposium on Electromagnetic Compatibility, 2008. APEMC 2008. Asia-Pacific Symposium on; 06/2008
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    ABSTRACT: This paper investigates the interactions between incident electromagnetic wave and nanoparticles, especially metallic nanoparticles. The scattering of nanoparticles is characterized by using volume integral equation. By considering the total electric field, i.e. the sum of incident fields and the radiated fields by equivalent electric volume currents, the volume integral equation can be established within the scatterers. The resultant volume integral equation is discretized using appropriate basis functions and is solved numerically using a matrix solver. Numerical results are presented to demonstrate the application of volume integral equation to analyze the plasmon resonance.
    Microwave Conference, 2007. APMC 2007. Asia-Pacific; 01/2008
  • Wei-Bin Ewe, Hong-Son Chu, Er-Ping Li
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    ABSTRACT: The interactions between electromagnetic field and arbitrarily shaped metallic nanoparticles are numerically investigated. The scattering and near field intensity of nanoparticles are characterized by using volume integral equation which is formulated by considering the total electric field, i.e. the sum of incident fields and radiated fields by equivalent electric volume currents, within the scatterers. The resultant volume integral equation is then discretized using divergence-conforming vector basis functions and is subsequently solved numerically. Numerical examples are presented to demonstrate the application of volume integral equation to capture and analyze the surface plasmon resonance of arbitrarily shaped metallic nanoparticles. The effects of illumination angles and background media to the surface plasmon resonance are also investigated. The results show that our proposed method is particularly useful and accurate in characterizing the surface plasmon properties of metallic nanoparticles.
    Optics Express 01/2008; 15(26):18200-8. · 3.55 Impact Factor
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    ABSTRACT: In summary, we have presented an H-shaped plasmonic coupler which is based on the metal-dielectric-metal based nano-slot waveguides. The analyses of the plasmonic coupler have been carried out by using the volume integral equation method. The parametric studies of several geometry parameters have also been performed. From the results we obtained, it is found that light can be efficiently coupled into different ports and the operating wavelength of the coupler can be effectively tuned by varying the ratio between width a and b.
    01/2008;
  • Hong-Son Chu, Wei-Bin Ewe, Er-Ping Li
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    ABSTRACT: The optical response in visible wavelengths of a single-chain of elliptical silver nanowires is investigated for different separation distances and illumination directions. The efficient and simple method, surface integral equation, is used to characterize the above arrays. The results show that the occurrence and magnitude of plasmon resonances as well as the field intensity are depended on these parameters. Strong field enhancement can be observed in the gap between nanowires of the single chain.
    Nanotechnology, 2007. IEEE-NANO 2007. 7th IEEE Conference on; 09/2007
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    ABSTRACT: A fast solution to the electromagnetic scattering by large-scale three-dimensional magnetodielectric objects with arbitrary permittivity and permeability is presented. The scattering problem is characterized by using coupled field volume integral equation (CF-VIE). By considering the total electric and magnetic fields, i.e., the sum of incident fields and the radiated fields by equivalent electric and magnetic volume currents, the CF-VIE can be established in the volume of the scatterers. The resultant CF-VIE is discretized and solved by using the method of moments (MoM). For large-scale scattering problems, the adaptive integral method (AIM) is then applied in the MoM in order to reduce the memory requirement and accelerate the matrix-vector multiplication in the iterative solver. The conventional AIM has been modified to cope with the two sets of equivalent volume currents.
    IEEE Transactions on Antennas and Propagation 08/2007; · 2.33 Impact Factor
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    ABSTRACT: The surface integral equation (SIE) method is utilized to characterize plasmonic waveguide made of two parallel chains of silver nanowires with radius of 25nm fed by a V-shaped funnel at a working wavelength of 600nm. The efficiency of energy transport along the waveguide due to surface plasmonic coupling is investigated for different dimensions and shapes. The opening angle of the V-shaped funnel region for optimum light capturing is included in the investigation as well. A long plasmonic double-chain waveguide of length ~3.3mum has been analyzed and optimized.
    Optics Express 05/2007; 15(7):4216-23. · 3.55 Impact Factor
  • Wei-Bin Ewe, Er-Ping Li, Le-Wei Li
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    ABSTRACT: A fast technique based on the volume integral equation and the adaptive integral method is presented for efficient analysis of electromagnetic transmission through arbitrarily shaped dielectric radomes. The method of moments is used to discretize and to convert the resultant integral equation into a matrix equation. Then adaptive integral method is applied to reduce the memory requirement for matrix storage and to accelerate the matrix-vector multiplication. Numerical examples are presented to demonstrate the applicability of the method.
    Microwave Conference, 2006. APMC 2006. Asia-Pacific; 01/2007
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    Yuan Gao, B.-L. Ooi, Wei-Bin Ewe, A.P. Popov
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    ABSTRACT: A novel wideband hybrid dielectric resonator antenna structure comprises a rectangular dielectric resonator (DR) and a coplanar waveguide (CPW) inductive slot is proposed. In this configuration, the CPW inductive slot simultaneously acts as an effective radiator and the feeding structure of the DR. Dual resonances of the two radiators are merged to extend the antenna's bandwidth. A parametric study is performed to optimize the antenna performance and a prototype for 5-GHz WLAN application has been built and tested.
    IEEE Microwave and Wireless Components Letters 05/2006; · 1.78 Impact Factor
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    Wei-Bin Ewe, Le-Wei Li, Che-Sau Chang
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    ABSTRACT: In this paper, the adaptive integral method (AIM) is used to analyze the scattering and radiation by arbitrary conducting surface/wire configuration. The scattering problem is characterized using electric field integral equation and is solved by the method of moments (MoM). The AIM is implemented in the iterative solver to accelerate the matrix-vector multiplication and to reduce the memory requirement for the matrix storage.
    Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings; 01/2006
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    ABSTRACT: The performance of three preconditioners, namely, diagonal, block-diagonal, and incomplete lower-upper preconditioners, are investigated in this communication for increasing the efficiency of iterative solvers in adaptive integral method implementation. These preconditioners are implemented to accelerate the solution of electromagnetic scattering problems in a comparative study. Numerical results have shown some improvements in convergence rate, when these preconditioners are employed.
    IEEE Transactions on Antennas and Propagation 08/2005; · 2.33 Impact Factor
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    ABSTRACT: This paper presents the adaptive integral method (AIM) utilized to solve electromagnetic scattering problems of an arbitrarily shaped conducting body with parametric geometry. The combined field integral equation is used to characterize the scattering problems of a closed conducting body whose surfaces are modeled using curvilinear patches. The formulated integral equations are then discretized and converted to a matrix equation using the method of moments. The resultant matrix equation is then solved by an iterative solver and the AIM is employed to accelerate the matrix-vector multiplication. Numerical results are presented to demonstrate the efficiency of the technique.
    IEEE Antennas and Wireless Propagation Letters 02/2005; · 1.67 Impact Factor
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    ABSTRACT: This paper presents an analysis of electrically large antennas using the adaptive integral method (AIM). The arbitrarily shaped perfectly conducting surfaces are modeled using triangular patches and the associated electric field integral equation (EFIE) is solved for computing the radiation patterns of these antennas. The method of moments (MoM) is used to discretize the integral equations and the resultant matrix system will be solved by an iterative solver. The AIM is employed in the iterative solver to speed up the matrix-vector multiplication and to reduce the memory requirement. As specific applications, radiation patterns of parabolic reflectors and X-band horns are computed using the proposed method.
    01/2005;
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    Wei-Bin Ewe, Le-Wei Li, Mook-Seng Leong
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    ABSTRACT: This paper presents the adaptive integral method utilized to solve scattering problems of mixed dielectric and conducting objects using volume-surface integral equation. The scattering problem is formulated using volume integral equation and surface integral equation for dielectric material object and conducting object, respectively. The combined field integral equation is formulated to treat closed conducting surfaces. The method of moments is applied to discretize the integral equations. The resultant matrix system is solved by an iterative solver where the adaptive integral method is employed to accelerate the matrix-vector multiplication. The block diagonal preconditioner is implemented to further accelerate the convergence of the present solution. Numerical results are presented to demonstrate the accuracy and efficiency of the technique.
    IEEE Transactions on Antennas and Propagation 12/2004; · 2.33 Impact Factor
  • Wei-Bin Ewe, Le-Wei Li, Mook-Seng Leong
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    ABSTRACT: This paper presents the adaptive integral method (AIM) to solve scattering problem of mixed dielectric/conducting object. The scattering problem is formulated using the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) and electric field integral equation approach for the dielectric and conducting body respectively. The integral equations using these approaches eliminate the interior resonance and produce accurate result. Method of moments (MOM) apply to discretize the integral equations. The resultant matrix system is solved by iterative solver with AIM. Numerical results are presented to demonstrate the accuracy and efficiency of the technique.
    Antennas, Propagation and EM Theory, 2003. Proceedings. 2003 6th International SYmposium on; 01/2003