Faculté des sciences

Diffractive elements designed to suppress unwanted zeroth order due to surface depth error

Kettunen, Ville ; Jefimovs, Konstantins ; Simonen, Janne ; Ripoll, Olivier ; Kuittinen, Markku ; Herzig, Hans-Peter

In: Journal of Modern Optics, 2004, vol. 51, no. 14, p. 2111-2123

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... Plus

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    Summary
    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.