Fig. 7

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(a) Schematics of our polarization-detecting experiments. The inset depicts a general elliptic polarization state defined by the orientation angle and the degree of ellipticity
. (b) Polarization states of the input beam are measured by our experiments (symbols), and are compared with the input values (lines). (c) Illustration of the metagrating’s working principle. An incoming beam with an unknown polarization state is on reflection represented in the bases
, and
, thereby allowing one to determine the Stokes parameters and, hence, the state of polarization without the need of multiple measurements or an interferometric setup. (a) and (b) reproduced with permission from [
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] © 2015, Wiley-VCH. (c) and (d) reproduced with permission from [
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] © 2015,OSA.