Two-step photoionization of cold atoms by two-color evanescent-light waves and application to atom detection with high spatial resolution |
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Authors: | Kazuhiro Yamamoto Haruhiko Ito Kouki Totsuka Tomohiro Sato |
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Affiliation: | Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8502, Japan |
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Abstract: | We consider a new scheme of optically ionizing atoms with 10-nm-order spatial resolution. In this method, two-color near-field lights are generated on a narrow slit illuminated by two-color evanescent lights via total-internal reflection of two-wavelength light beams. In order to illustrate the feasibility, we first obtain the ionization cross section from two-step photionization of cold Rb atoms by two-color evanescent lights on a plane surface of a prism. Then, we numerically estimate the ionization efficiency as a function of the slit width using Bethe formula. The scheme is useful for detecting ground-state atoms under less perturbation by scattered light. |
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Keywords: | 32.80.Fb 87.64.Xx |
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