SPECTRAL DIFFRACTIVE LENSES FOR PRODUCING A LIGHT SOURCE WITH RADIATION OF SEVERAL SPECIFIED WAVELENGTHS
R. V. Skidanov1,2, L. L. Doskolovich1,2, V. S. Vasil'iev2, S. V. Ganchevskaya1,2, V. A. Blank1,2, V. V. Podlipnov2, N. L. Kazanskiy1,2
1Korolev Samara National Research University, Samara, Russia
2Image Processing Systems Institute of RAS - Branch of the Crystallography and Photonics Federal Scientific Research Center, Russian Academy of Sciences RAS, Samara, Russia
Keywords: дифракционная линза, точечный световой источник, спектральная дифракционная линза, возбуждение молекул белка, diffractive lens, point light source, spectral diffractive lens, excitation of protein molecules
Abstract
It is proposed to use spectral diffractive lenses with the focus of the same position of several specified wavelengths as the basis for a point light source with several specified wavelengths. A spectral diffractive lens designed to focus three wavelengths: 462, 608, and 952 nm (excitation wavelengths for tubulin fluorescence β) is considered. The spectral lenses were fabricated by direct laser writing in photoresist with iterative correction of recording parameters, which ensured an error of less than 30 nm in the formation of the diffractive microrelief height. An experimental determination of the wavelengths focused by the obtained lens using a point aperture located at the focus of a spectral lens is described.
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