53 research outputs found
Programmable multiport optical circuits in opaque scattering materials
We propose and experimentally verify a method to program the effective
transmission matrix of general multiport linear optical circuits in random
multiple-scattering materials by phase modulation of incident wavefronts. We
demonstrate the power of our method by programming linear optical circuits in
white paint layers with 2 inputs and 2 outputs, and 2 inputs and 3 outputs.
Using interferometric techniques we verify our ability to program any desired
phase relation between the outputs. The method works in a deterministic manner
and can be directly applied to existing wavefront-shaping setups without the
need of measuring a transmission matrix or to rely on sensitive interference
measurements.Comment: 14 pages, 7 figure
Programming balanced optical beam splitters in white paint
Wavefront shaping allows for ultimate control of light propagation in
multiple-scattering media by adaptive manipulation of incident waves. We shine
two separate wavefront-shaped beams on a layer of dry white paint to create two
enhanced output speckle spots of equal intensity. We experimentally confirm by
interference measurements that the output speckle spots are almost correlated
like the two outputs of an ideal balanced beam splitter. The observed
deviations from the phase behavior of an ideal beam splitter are analyzed with
a transmission matrix model. Our experiments demonstrate that wavefront shaping
in multiple-scattering media can be used to approximate the functionality of
linear optical devices with multiple inputs and outputs
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