Image enhancement in near-field scanning optical microscopy with laser-trapped metallic particles
1999; Optica Publishing Group; Volume: 24; Issue: 2 Linguagem: Inglês
10.1364/ol.24.000074
ISSN1539-4794
Autores Tópico(s)Advanced Fluorescence Microscopy Techniques
ResumoA 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 ?m, 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??m gold particle leads to image contrast that is approximately three times as great as that obtained with a 0.1??m gold particle, and interference patterns of a subwavelength period are obtained in both cases.
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