15 March 2013 Asymmetric direction selective filter elements based on high-contrast gratings
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Proceedings Volume 8633, High Contrast Metastructures II; 86330Z (2013) https://doi.org/10.1117/12.2003930
Event: SPIE OPTO, 2013, San Francisco, California, United States
Abstract
We present novel filter elements with an asymmetric angle dependent transmission based on high-contrast gratings. Asymmetric means a different efficiency for positive and negative incidence angles. Our approach provides the realization of asymmetric direction selective filters by using blaze-like grating structures combined with subwavelength high contrast gratings respectively grating periods in the resonance domain. We also discuss the influence of the effective medium theory on the transmission function depending on the angle of the incident light. For realization of those high contrast gratings Silicon is chosen as material with high refractive index and adequate compatibility with semiconductor fabrication.
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Stefan Steiner, Stefan Steiner, Stefanie Kroker, Stefanie Kroker, Thomas Käsebier, Thomas Käsebier, Daniel Voigt, Daniel Voigt, Jörg Fuchs, Jörg Fuchs, Frank Fuchs, Frank Fuchs, Ernst-Bernhard Kley, Ernst-Bernhard Kley, Andreas Tünnermann, Andreas Tünnermann, } "Asymmetric direction selective filter elements based on high-contrast gratings", Proc. SPIE 8633, High Contrast Metastructures II, 86330Z (15 March 2013); doi: 10.1117/12.2003930; https://doi.org/10.1117/12.2003930
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