Remove the filter?
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You can record how the particles hit the back wall, but not save the data on which slit they passed through. But I don't know if that would cause the interference pattern to return.
I think you and StaySharp are talking about different things. The original question in this thread was how to detect a particle, like an electron, while StaySharp is talking about photons (what makes up light). Particles do not have a polarisation.
Right, particles in the sense of matter with mass do not have a polarisation like light.
However photons are also particles, just without mass. And just like electrons they can be in both the state of an distinct particle and a wave. Otherwise it wouldn't be possible to use both for the DS-experiment.
No, they're actually waves. See double slit interference.
WHAT IS HAPPENING
Actually they're wave-particles. See wave-particle duality.
^ I was just pointing out that someone saying "well they're not really particles" is incorrect. They have just as much right to be called particles as waves, and vice versa.