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Sharp focusing of a mixture of radially and linearly polarized beams using a binary microlens
S.S. Stafeev, L. O’Faolain, M.I. Shanina, A.G. Nalimov, 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: 10.18287/0134-2452-2014-38-4-606-613

Pages: 606-613.

Abstract:
Using a binary microlens of diameter 14 µm and focal length 532 nm (numerical aperture NA = 0.997), we focus a 633-nm laser beam composed of a mixture of radially and linearly polarized waves obtained by reflection of a linearly polarized Gaussian beam from a gold-coated subwavelength binary four-zone diffractive optical microelement (micropolarizer) of size 100×100 µm to a near-surface, near-circular focal spot of size (0.37±0.02)λ and (0.39±0.02)λ, where λ is wavelength. A linearly polarized light beam forms an elliptical focal spot with diameters (0.35±0.02)λ and (0.41±0.02)λ. Both focal spots have the area of 0.133λ². Subwavelength focusing using two microoptical components (a binary microlens and a micropolarizer) is suggested for the first time.

Key words:
radial polarization, reflective subwavelength diffractive grating, binary optics, micro-optics, subwalength focal spot, near-field microscopy.

Citation:
Stafeev SS, O’Faolain L, Shanina MI, Nalimov AG, Kotlyar VV. Sharp focusing of a mixture of radially and linearly polarized beams using a binary microlens. Computer Optics 2014; 38(4): 606-613. DOI: 10.18287/0134-2452-2014-38-4-606-613.

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