Reflective Inverse Diffusion

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.

[1]  J. Goodman.  Introduction to Fourier optics , 1969 .

[2]  Hasan Yılmaz,et al.  Optimal control of light propagation through multiple-scattering media in the presence of noise. , 2013, Biomedical optics express.

[3]  A. Mosk,et al.  Phase control algorithms for focusing light through turbid media , 2007, 0710.3295.

[4]  A. Mosk,et al.  Control of light transmission through opaque scattering media in space and time. , 2010, Physical review letters.

[5]  Florent Krzakala,et al.  Reference-less measurement of the transmission matrix of a highly scattering material using a DMD and phase retrieval techniques. , 2015, Optics express.

[6]  J. Goodman.  Speckle Phenomena in Optics: Theory and Applications , 2020 .

[7]  O. Katz,et al.  Looking around corners and through thin turbid layers in real time with scattered incoherent light , 2012, Nature Photonics.

[8]  Sandeep Kumar,et al.  Appl. Sci , 2013 .

[9]  I. Vellekoop.  Feedback-based wavefront shaping. , 2015, Optics express.

[10]  David George Voelz,et al.  Computational Fourier Optics: A MATLAB Tutorial , 2011 .

[11]  I. Freund.  Looking through walls and around corners , 1990 .

[12]  S. Popoff,et al.  Controlling light through optical disordered media: transmission matrix approach , 2011, 1107.5285.

[13]  Kamel S. Saidi,et al.  Target penetration of laser-based 3D imaging systems , 2009, Electronic Imaging.

[14]  Steve Marschner,et al.  Dual photography , 2005, ACM Trans. Graph..

[15]  Jonghee Yoon,et al.  Measuring optical transmission matrices by wavefront shaping. , 2015, Optics express.

[16]  A. Mosk,et al.  Focusing coherent light through opaque strongly scattering media. , 2007, Optics letters.

[17]  D. Conkey,et al.  High-speed scattering medium characterization with application to focusing light through turbid media. , 2012, Optics express.

[18]  Meng Cui.  A high speed wavefront determination method based on spatial frequency modulations for focusing light through random scattering media. , 2011, Optics express.

[19]  I. Vellekoop.  Controlling the propagation of light in disordered scattering media , 2008, 0807.1087.

[20]  S. Popoff,et al.  Measuring the transmission matrix in optics: an approach to the study and control of light propagation in disordered media. , 2009, Physical review letters.

[21]  J. Walkup,et al.  Statistical optics , 1986, IEEE Journal of Quantum Electronics.

[22]  A. P. Mosk,et al.  Focusing of light by random scattering , 2006 .

[23]  A. Mosk,et al.  Exploiting disorder for perfect focusing , 2009, 0910.0873.