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31 May 2002 Optical properties of spherical microlens
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Scanning optical far and near-field microscopes resolution is limited by light spot size used to scan a sample. The focusing elements in scanning microscopes are ordinary used lenses with dimensions of rather more than a light wavelength. The focus spot size of such lens is limited by well-known diffraction limit. However, if a lens dimension is comparable with a light wavelength the Fresnel's diffraction formula of focus spot size calculation is not suitable. At present, there are no data about theoretical or experimental studies of the small lenses and even about their fabrication methods. A new fabrication method of small spherical glass lenses with diameters from 1 micrometers to 100 micrometers is considered, and some theoretical approaches to the focus spot size calculation and its experimental measurement are discussed in the paper. The lenses fabrication method is based on melting of fine glass powder with oxygen-acetylene burner with subsequent lenses selection under conventional light microscope. To calculate a spot size of the small lens the Mie theory of light scattering in near field by small spherical particles has been used. The calculated light intensity diagrams for spherical lens in near field are presented.
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Uryi P. Volkov, Uryi A. Avetisyan, Vil B. Baiburin, and Natalija V. Bespalova "Optical properties of spherical microlens", Proc. SPIE 4705, Saratov Fall Meeting 2001: Coherent Optics of Ordered and Random Media II, (31 May 2002);

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