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15 May 2002 Optical properties of spherical microlenses
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A scanning optical far and near-field microscopes resolution is limited by focused light spot size used to scan a sample. As a focusing element 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 to 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 the ones fabrication methods. This paper is considers the fabrication method of small spherical glass lenses with diameters from 1 um to 100 um and discusses some theoretical approaches to the focus spot size calculation and it experimental measurement. 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 light intensity diagrams of sphere lens of various diameters calculated by developed program are presented.
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Uryi P. Volkov, Yuri A. Avetisyan, Vil B. Baiburin, and Natalija V. Bespalova "Optical properties of spherical microlenses", Proc. SPIE 4621, Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing IX, (15 May 2002);

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