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Stafeev SS, O'Faolain L, Kotlyar VV, et al. Tight focus of light using micropolarizer and microlens. Appl Opt. 2015;54(14):4388-94doi: 10.1364/AO.54.004388.
Stafeev, S. S., O'Faolain, L., Kotlyar, V. V., & Nalimov, A. G. (2015). Tight focus of light using micropolarizer and microlens. Applied optics, 54(14), 4388-94. https://doi.org/10.1364/AO.54.004388
Stafeev, Sergey S, et al. "Tight focus of light using micropolarizer and microlens." Applied optics vol. 54,14 (2015): 4388-94. doi: https://doi.org/10.1364/AO.54.004388
Stafeev SS, O'Faolain L, Kotlyar VV, Nalimov AG. Tight focus of light using micropolarizer and microlens. Appl Opt. 2015 May 10;54(14):4388-94. doi: 10.1364/AO.54.004388. PMID: 25967493.
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Appl Opt. 2015 May 10;54(14):4388-94. doi: 10.1364/AO.54.004388.

Tight focus of light using micropolarizer and microlens.

Applied optics

Sergey S Stafeev, Liam O'Faolain, Victor V Kotlyar, Anton G Nalimov

PMID: 25967493 DOI: 10.1364/AO.54.004388

Abstract

Using a binary microlens of diameter 14 μm and focal length 532 nm (NA=0.997) in resist, we focus a 633 nm laser beam into a near-circular focal spot with dimensions (0.35 ± 0.02)λ and (0.38 ± 0.02)λ (λ is incident wavelength) at full width half-maximum intensity. The area of the focal spot is 0.105λ(2). The incident light is a mixture of linearly and radially polarized beams generated by reflecting a linearly polarized Gaussian beam at a 100  μm × 100  μm four-sector subwavelength diffractive optical microelement with a gold coating. The focusing of a linearly polarized laser beam (the other conditions being the same) is found to produce an elliptical focal spot measuring (0.40 ± 0.02)λ and (0.50 ± 0.02)λ. To our knowledge, this is the first implementation of subwavelength focusing of light using a pair of micro-optic elements (a binary microlens and a micropolarizer).

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