Imaging with a Rigid Multimode Fiber Bundle

A rigid multimode fiber bundle is proposed for imaging, in an experimental setup with no interferometric measurements. The great amount of propagating modes in the fiber bundle, along with its high numerical aperture, enable us to set predetermined focus targets with, approximately, 60 μm resolution. In order to do so, an optimization process to build transmission matrices was applied to overcome modal interference and obtain focus. Here, we also show that transmission matrices could be stored and combined, so focus could be simultaneously achieved in different locations, at the distal end of the fiber bundle.