Near-field-light lens for nano-focusing of atoms

Hiroshi Kanda, Keiichi Muraishi, Kouki Totsuka, Kazuhiro Yamamoto, Haruhiko Ito

Research output: Chapter in Book/Report/Conference proceedingConference contribution


It is an important subject to make a nano-scale structure with an arbitrary shape at an arbitrary position. To this end, we are developing several near-field optical devices for precise atom control and deposition [1]. Here, we describe a near-field-light lens for focusing of atoms on a nano-size spot. Figure 1 is a sketch of the near-field-light lens. Repulsive dipole forces from near-field lights focus atoms passing through a small aperture, The upper SEM image shows the top view of the device fabricated from a Silicon-on-Insulator substrate by photolithography and anisotropic chemical etching. Near-field lights are generated around the aperture at the bottom by illuminating each side with four blue-detuned light beams guided through optical fibers. As shown in the lower SEM image, the was of window is 400 nm × 500 inn. The radius of curvature of the edge is 50 nm, which almost equals the decay length of the near-field lights. The near-field optical device works as a lens with a focal length of 10 um, a focal depth of 10 nm, and NA of 0.14 for Rb atoms with the velocity of 10 m/s in the case where the incident light intensity is 10 7 mW/cm2 and the blue detuning is 1.5 GHz. Figure 2 shows the distribution of the Rb atoms at the focal point obtained from Fourier optics under Fraunhofer-diffradion conditions, in this case, the FWHM is estimated to be about 1 nm, which is comparable to the de Broglie wavelength. We will also report the experimental progress.

Original languageEnglish
Title of host publication2005 European Quantum Electronics Conference, EQEC '05
Number of pages1
Publication statusPublished - 2005
Externally publishedYes
Event2005 European Quantum Electronics Conference, EQEC '05 - Munich, Germany
Duration: Jun 12 2005Jun 17 2005

Publication series

Name2005 European Quantum Electronics Conference, EQEC '05


Other2005 European Quantum Electronics Conference, EQEC '05

All Science Journal Classification (ASJC) codes

  • General Engineering


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