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Bulletin of the American Physical Society

Fluctuating Potentials In Micrometer Scale Atomic Ion Traps

J.D. Britton, Signe Louise Seidelin, John Chiaverini, R. Reichle, J. J. Bollinger, Dietrich G. Leibfried, Janus H. Wesenberg, R. B. Blakestad, R. J. Epstein, Nobuyasu Shiga, Jason Amini, Kenneth R. Brown, Jonathan Home, David B. Hume, Wayne M. Itano, John D. Jost, C. Langer, Roee Ozeri, David J. Wineland

Published Mar 7, 2007• 0 citations
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We report the laser cooling and trapping of barium ions in a novel planar Paul trap. Unlike other rf quadrupole traps, the electrodes of a planar Paul trap are confined to one or more parallel planes. They may therefore be constructed on a micrometer scale by the same photolithographic techniques used for semiconductor devices. Such devices are under construction in our laboratory. Micro-traps permit entirely new studies, for example, superradiance of a few ions, which occurs as ion-ion distances approach one wavelength of light. Photolithography can also generate an array of traps on a single substrate for an atomic clock. Our traps consist of one or more parallel planes, one above the other, each plane having either a conducting ring or a hole in a conducting sheet. Thus, a ring or a hole results in a potential well for trapping. A three-ring design produces a quadrupole potential that is harmonic up to eighth-order for a particular choice of ring diameters and spacings. Three-hole traps have been constructed with inner hole radii ranging from 50 to 400 μm, and both single barium ions and clouds have been observed.