About 15 years ago I saw Paul Kwiat at UIUC give a talk on "Interaction Free Measurements" which seems to be effectively the same thing as here. (cf http://physics.illinois.edu/people/kwiat/interaction-free-me... )
I could never figure out why this did not get more attention at the time
Is this really "Interaction Free"? You're hitting it with photons. They comment on using low-energy photons, but that just minimizes the interaction, while still producing something useful (visible spectrum image).