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

Min Gu, Pu Chun Ke

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4 Citations (Scopus)


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 2 μm, 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.

Original languageEnglish
Pages (from-to)74-76
Number of pages3
JournalOptics Letters
Issue number2
Publication statusPublished - 15 Jan 1999
Externally publishedYes

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