Observation of the branched flow of spatially incoherent light in dish soap PhysRevX
Experimental setup showing the main components, the path the light beam follows, and the imaging system. Effective refractive index landscape of a soap film reconstructed using DNN from an image of the halogen light reflected from the film. BF generated by a coherent plane wave. BF generated by a localized source coupled to the film .
Prior research has shown that light moving through a disordered media can lead to branching, where some amount of a beam can take one path around an object while another part of the same beam can take another path. Such branching can lead to channels of light moving through a given medium. In this new effort, the researchers used liquid dish soap as the medium.
The team applied liquid dish soap to a plate of glass and then shined a light through it from a side edge. They took pictures from above as the light moved through the soap toward the opposite edge. To enhance the action, the researchers added some dye that grew brighter as it was struck by more light, which was applied using anStudying the photographs, the researchers were able to observe the light initially strike a dense portion of the soap, then split and create two channels.
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