Polarizing and focusing properties of reflective fresnel zone plate
S.S. Stafeev, V.V. Kotlyar

Image Processing Systems Institute, Russian Academy of Sciences,
Samara State Aerospace University

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Full text of article: Russian language.

DOI: 10.18287/0134-2452-2014-38-3-456-462

Pages: 456-462.

Abstract:
Polarizing and focusing properties of binary Fresnel zone plate (FZP) designed for x-ray was investigated experimentally in visible range for wavelengths 405 nm, 445 nm, and 633 nm. It was shown that peripheral FZP zones rotate the direction of polarization of linearly-polarized incident light on angle equal to doubled angle between incident polarization and relief direction. Illuminated by red and blue linearly polarized light FZP forms 3 focal spots, located on distances that decrease with wavelength decreasing. Minimal focal spot on distance of 105 um above the surface was elliptical and has maximal intensity 9 times larger than the intensity of incident light, and half maximum diameter of diffractive limit of our optical system (2 of wavelength). Peripheral part of FZP forms diffractive limited focal point on distance of 2.8 um that has diameter 9 of wavelength.

Key words:
reflective Fresnel zone plate, polarization rotation, multifocal lens.

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