Abstract
We have successfully designed and measured a unique polarisation splitting lens which focuses the orthogonal linear polarisations side-by-side in the lens focal plane. This concept can find application in situations where there is limited space for the beam splitters and focusing optics that are required for incoherent detectors.
Highlights
It has been recently shown that metal mesh technology can be used to create a flat lenses [1,2,3]
The phase approach can be used as single surfaces as outlined in the review by Yu et al [3] or as stacks of phased surfaces as demonstrated by Pisano [2]
An issue with the phase approach is that the chosen unit cell design has to be able to generate the entire required phase change, which usually leads to a design that is resonant, narrow band, and has un-wanted polarisation effects
Summary
It has been recently shown that metal mesh technology can be used to create a flat lenses [1,2,3] These types of lens offer a viable alternative to traditional dielectric counterparts with the advantage of having reduced thickness and mass for a lens of comparable focal length. To avoid confusion with the existing flat lenses, we referrer to this new device as a pol-lens The advantage of such a device is that two polarisation-insensitive detectors could be placed adjacently in the focal plane to directly measure the linear polarisation state of the incoming beam. To determine the state of polarisation, beam splitters and polarizers must be used, which open additional ports in a system and enlarge the overall volume of the detecting system This novel device could offer a compact polarimetric detecting unit
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