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Optics Letters

Optics Letters


  • Vol. 24, Iss. 2 — Jan. 15, 1999
  • pp: 74–76

Image enhancement in near-field scanning optical microscopy with laser-trapped metallic particles

Min Gu and Pu Chun Ke  »View Author Affiliations

Optics Letters, Vol. 24, Issue 2, pp. 74-76 (1999)

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A trapped-particle near-field scanning optical microscope is constructed by use of submicrometer- or micrometer-sized metallic particles (gold and silver) to increase scattering efficiency. The image contrast of the evanescent-wave interference pattern on the surface of a prism upon total internal reflection, obtained with trapped gold particles of diameter 0.1 and 2µm , is improved by a factor of approximately 2 and 1.5, respectively, compared with that obtained with trapped polystyrene particles of similar size. The use of a 2-µm gold particle leads to image contrast that is approximately three times as great as that obtained with a 0.1-µm gold particle, and interference patterns of a subwavelength period are obtained in both cases.

© 1999 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(180.5810) Microscopy : Scanning microscopy

Min Gu and Pu Chun Ke, "Image enhancement in near-field scanning optical microscopy with laser-trapped metallic particles," Opt. Lett. 24, 74-76 (1999)

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