Diffractive elements designed to suppress unwanted zeroth order due to surface depth error |
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| Authors: | Ville Kettunen Konstantins Jefimovs Janne Simonen Olivier Ripoll Markku Kuittinen Hans Peter Herzig |
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| Affiliation: | 1. Institute of Microtechnology, University of Neuchǎtel , Breguet 2, CH-2000 , Neuchǎtel , Switzerland;2. University of Joensuu, Department of Physics , PO Box 111, FIN-80101 , Joensuu , Finland |
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| Abstract: | Abstract We consider a design approach to reduce unwanted zero-order intensity due to profile depth error in diffractive elements. Our method is based on addition of local bias phase to a binary element phase, leading to the introduction of a third phase level. We show theoretically and experimentally that gratings obtained with such modifications are more tolerant to profile depth error than conventionally designed binary or multilevel elements, thus reducing the appearance of unwanted zero order. |
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