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Polarisers in the focal domain: theoretical model and experimental validation

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Martínez Herrero, Rosario and Maluenda, David and Juvells, Ignasi and Carnicer, Artur (2017) Polarisers in the focal domain: theoretical model and experimental validation. Scientific reports, 7 . ISSN 2045-2322

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Official URL: https://doi.org/10.1038/srep42122


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Abstract

Polarisers are one of the most widely used devices in optical set-ups. They are commonly used with paraxial beams that propagate in the normal direction of the polariser plane. Nevertheless, the conventional projection character of these devices may change when the beam impinges a polariser with a certain angle of incidence. This effect is more noticeable if polarisers are used in optical systems with a high numerical aperture, because multiple angles of incidence have to be taken into account. Moreover, the non-transverse character of highly focused beams makes the problem more complex and strictly speaking, the Malus' law does not apply. In this paper we develop a theoretical framework to explain how ideal polarisers affect the behavior of highly focused fields. In this model, the polarisers are considered as birefringent plates, and the vector behaviour of focused fields is described using the plane-wave angular spectrum approach. Experiments involving focused fields were conducted to verify the theoretical model and a satisfactory agreement between theoretical and experimental results was found.


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© The Author(s) 2017.
This work is supported by Ministerio de Economía y Competitividad (MINECO) under grant numbers FIS2013-46475-C3-1-P, FIS2013-46475-C3-2-P, TEC2014-57394-P and FIS2016-75147-C3-1-P.

Uncontrolled Keywords:Cylindrical vector beams; Highly focused fields; Jones matrix-method; Layered media; Polarization; Optics; Propagation; Plane; Light; Spot
Subjects:Sciences > Physics > Optics
ID Code:42389
Deposited On:27 Apr 2017 17:46
Last Modified:27 Apr 2017 17:46

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