The Repulsive Casimir Force with Metallic Ellipsoid Structure

Abstract

We propose a new structure, one plate with a hole above the ellipsoid and the other plate with a hole below the ellipsoid, to obtain a repulsive Casimir force. The force was obtained numerically by using the in-house FDTD method, based on Maxwell’s stress tensor and harmonic expansion. The code can be verified by calculating the force of a perfect-metal ellipsoid centered above a perfect-metal plate with a hole. Our numerical method can effectively simulate the Casimir force by reducing the total simulated time. The further numerical results of realistic dielectric material immersing in fluids or adding other plates above the ellipsoid are also presented. It is not surprising to find that the larger differences can be achieved by varying the parameters such as the center-center separation, medium immersed, and the dielectric material of the structure. Thus, it is possible to tune these parameters relatively in the realistic microelectromechanical systems to overcome stiction and friction problems.

Modeling of Scattering Cross Section for Mineral Aerosol with a Gaussian Beam

“…And some common theories and methods have been utilized to analyze this problem. When the plane light wave is incident into the particle, the classical Mie theory, the discrete dipole approximation (DDA), the T matrix method, and the finite difference time domain (FDTD) method can be used for sphere and nonsphere particles [6][7][8][9]. Nevertheless, none of those methods can be applied to analyze and calculate the scattering of particles for the nonplane waves such as the Gaussian beam incidence or a top-hat beam.…”

Repulsive lateral van der Waals force

“…The repulsive aspect of the dispersive forces has attracted growing interest [6,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. For example, a conducting spherical shell experiences an outward repulsive dispersive force [22].…”