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Appl. Sci. 2016, 6(12), 370; doi:10.3390/app6120370

Reflective Inverse Diffusion

1
Department of Engineering Physics, Air Force Institute of Technology, Wright-Patterson AFB, OH 45433, USA
2
Department of Physics, U.S. Air Force Academy, CO 80840, USA
3
Department of Mathematics & Statistics, Air Force Institute of Technology, Wright-Patterson AFB, OH 45433, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Totaro Imasaka
Received: 8 September 2016 / Revised: 12 November 2016 / Accepted: 14 November 2016 / Published: 24 November 2016
(This article belongs to the Section Optics and Lasers)
View Full-Text   |   Download PDF [2404 KB, uploaded 24 November 2016]   |  

Abstract

Phase front modulation was previously used to refocus light after transmission through scattering media. This process has been adapted here to work in reflection. A liquid crystal spatial light modulator is used to conjugate the phase scattering properties of diffuse reflectors to produce a converging phase front just after reflection. The resultant focused spot had intensity enhancement values between 13 and 122 depending on the type of reflector. The intensity enhancement of more specular materials was greater in the specular region, while diffuse reflector materials achieved a greater enhancement in non-specular regions, facilitating non-mechanical steering of the focused spot. Scalar wave optics modeling corroborates the experimental results. View Full-Text
Keywords: phase modulation; indirect photography; inverse diffusion; scattering; liquid crystal spatial light modulator; beam steering; enhancement phase modulation; indirect photography; inverse diffusion; scattering; liquid crystal spatial light modulator; beam steering; enhancement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Burgi, K.; Ullom, J.; Marciniak, M.; Oxley, M. Reflective Inverse Diffusion. Appl. Sci. 2016, 6, 370.

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