Patent ID: 8436317

Claim:
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 st electrode, a 2 nd electrode, a 3 rd electrode, a 4 th electrode, a 5 th electrode, a 6 th electrode, a 7 th electrode, an 8 th electrode, a 9 th electrode, a 10 th electrode, an 11 th electrode, and a 12 th electrode of the twelve electrodes are configured in a rotation sequence, 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 st and 7 th electrodes, the second plane of symmetry bisects the through slit between the 2 nd and 3 rd electrodes and the through slit between the 8 th and 9 th electrodes, the third plane of symmetry bisects the 4 th and 10 th electrodes, the fourth plane of symmetry bisects the through slit between the 5 th and 6 th electrodes and the through slit between the 11 th and 12 th electrodes, wherein said twelve electrodes are excited to generate an electric dipole field in a direction perpendicular to the optical axis.