I was wondering if there is a way of splitting a digital image sensor's surface in two and using it to capture a stereo version of an image, maybe using some clever optical system with mirrors (like a periscope... actually, two of them) or something. I want to reproduce that information as 3D on a screen.
There are numerous products available which do this exact thing. They are adapters which often fit over an existing lens to produce 2 images on the sensor.
A quick search on
3d lens will give you the most hits though it isn't something I'd consider an obvious search term.
Products I'm aware of include ranges from Loreo and Kula 3d. There is/was a 3d lens made by Canon but that was for video and I couldn't find a current page on their website (will update if I locate it).
Also you might be interested in the Samsung NX300 and 45mm 3d lens which uses a novel internal LCD to black out half the lens across 2 exposures to provide separate images to the sensor.