Focusing light into desired patterns through turbid media by feedback-based wavefront shaping

Author(s):

Lipeng Wan and Ziyang Chen and Huiling Huang and Jixiong Pu

Abstract:

“We demonstrate that the focusing of light into desired patterns through turbid media can be realized using feedback-based wavefront shaping. Three desired focused patterns—a triangle, a circle, and a rectangle—are used as examples to study this ability. During the process of modulating scattered light, the Pearson’s correlation coefficient is introduced as a feedback signal. It is found that the speckle field formed by the turbid media gradually transforms into the desired pattern through a process of modulation of the input beam wave front. The proposed approach has potential applications in biomedical treatment and laser material processing.”

Link to Publications Page

Publication: Applied Physics B
Issue/Year: Applied Physics, B 122, 204 (2016)
DOI: 10.1007/s00340-016-6466-0

Focusing coherent light through opaque strongly scattering media

Author(s): I. M. Vellekoop and A. P. Mosk

Abstract:

“We report focusing of coherent light through opaque scattering materials by control of the incident wavefront. The multiply scattered light forms a focus with a brightness that is up to a factor of 1000 higher than the brightness of the normal diffuse transmission.”

Link to Publications Page

Publication: Optics Letters
Issue/Year: Optics Letters, Vol. 32, Issue 16, pp. 2309-2311
DOI: 10.1364/OL.32.002309