Oral title: Investigating dust filtration in transition disks with millimeter-wave polarization Oral abstract: We study the dust filtration scenario for transition disks by predicting the polarization at ALMA bands due to scattered thermal emission, based on planet-disk interaction and self-consistent dust growth models. With radiative transfer calculations we investigate the polarization map, which shows three characteristic rings. For inclined disks the degree is high enough to be detected with ALMA.