Patent ID: 8436317
Filing Date: 2013-05-07
Classification: H01J

Abstract:
1. An electric device, comprising: twelve electrodes, inner ends of said twelve electrodes configuring a cylindrical through hole and an 8-fold symmetry, twelve through slits separating the twelve electrodes respectively and parallel to a central axis of said hole, said central axis being an optical axis of the electric device, wherein each of said twelve through slits has a central plane containing the optical axis, wherein a 1 wherein the 8-fold symmetry has four planes of symmetry, the first and the third planes of symmetry of the four planes of symmetry are perpendicular to each other, the second and the fourth planes of symmetry of the four planes of symmetry are perpendicular to each other, an angle between the first and the second planes of symmetry is 45°, and each of said four planes contains the optical axis, wherein the first plane of symmetry bisects the inner ends of the 1 wherein said twelve electrodes are excited to generate an electric dipole field in a direction perpendicular to the optical axis.