24 May 2018 Unconventional imaging with radial Walsh filters
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In this work, we report the achievement of images obtained with radial Walsh filters. Derived from Walsh functions, radial Walsh filters are phase binary diffractive optical elements characterized by a set of equal-area concentric rings that take the phase values 0 or π, corresponding to +1 or -1 transmittance values of the corresponding Walsh function. Then, a radial Walsh filter can be re-interpreted as an aperiodic zone plate with self-similar multi-focusing properties under monochromatic illumination and, therefore, multi-imaging capabilities. We have implemented these unconventional lenses with a spatial light modulator and the first images obtained with this type of lenses are presented and evaluated.
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Walter D. Furlan, Walter D. Furlan, Federico Machado, Federico Machado, Vicente Ferrando, Vicente Ferrando, Juan A. Monsoriu, Juan A. Monsoriu, } "Unconventional imaging with radial Walsh filters", Proc. SPIE 10677, Unconventional Optical Imaging, 106772N (24 May 2018); doi: 10.1117/12.2306984; https://doi.org/10.1117/12.2306984

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