Point-spread function engineering of imaging systems is a powerful approach to enhance their  functionality. It has been shown [1,2], that by introducting a suitably designed phase mask into the aperture plane of a lens-based imaging system, the retrieval of depth information from the intensity measured in the image plane is possible in addition to the usual two-dimensional image information.

Surfaces covered with resonant nanostructures enable a far-reaching control of the wavelength and polarization dependence of their transmission [3]. Hence, optical elements incorporating such nanostructured surfaces allow for controlling the point-spread function also in dependence on these properties. We aim to develop new approaches for point-spread function engineering and optical imaging, e.g. for multi-spectral and polarization-resolved imaging, based on these outstanding capabilites of nanostructured surfaces. Our research encorporates design of suitable wavelength or polarization dependent point-spread functions, design and manufacturing of the corresponding nanostructured optical elements, development of dedicated retrieval algorithms and experimental verification of these new imaging modalities.

[1] A. Greengard, Y. Y. Schechner, and R. Piestun, "Depth from diffracted rotation," Opt. Lett. 31, 181-183 (2006).

[2] R. Berlich, A. Bräuer, and S. Stallinga, "Single shot three-dimensional imaging using an engineered point spread function," Opt. Express 24, 5946-5960 (2016).

[3] B. Walther, C. Helgert, C. Rockstuhl, F. Setzpfandt, F. Eilenberger, E.-B. Kley, F. Lederer, A. Tünnermann, and T. Pertsch, "Spatial and Spectral Light Shaping with Metamaterials," Advanced Materials 24, 6300 (2012).

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