Light focusing through a multiple scattering medium: ab initio computer simulation

Oleksandr Danko; Volodymyr Danko; Andrey Kovalenko

doi:10.1117/12.2304849

18 January 2018 Light focusing through a multiple scattering medium: ab initio computer simulation

Oleksandr Danko, Volodymyr Danko, Andrey Kovalenko

Proceedings Volume 10612, Thirteenth International Conference on Correlation Optics; 1061216 (2018) https://doi.org/10.1117/12.2304849
Event: Thirteenth International Conference on Correlation Optics, 2017, Chernivtsi, Ukraine

Abstract

The present study considers ab initio computer simulation of the light focusing through a complex scattering medium. The focusing is performed by shaping the incident light beam in order to obtain a small focused spot on the opposite side of the scattering layer. MSTM software (Auburn University) is used to simulate the propagation of an arbitrary monochromatic Gaussian beam and obtain 2D distribution of the optical field in the selected plane of the investigated volume. Based on the set of incident and scattered fields, the pair of right and left eigen bases and corresponding singular values were calculated. The pair of right and left eigen modes together with the corresponding singular value constitute the transmittance eigen channel of the disordered media. Thus, the scattering process is described in three steps: 1) initial field decomposition in the right eigen basis; 2) scaling of decomposition coefficients for the corresponding singular values; 3) assembling of the scattered field as the composition of the weighted left eigen modes. Basis fields are represented as a linear combination of the original Gaussian beams and scattered fields. It was demonstrated that 60 independent control channels provide focusing the light into a spot with the minimal radius of approximately 0.4 μm at half maximum. The intensity enhancement in the focal plane was equal to 68 that coincided with theoretical prediction.

Citation Download Citation

Oleksandr Danko, Volodymyr Danko, and Andrey Kovalenko "Light focusing through a multiple scattering medium: ab initio computer simulation", Proc. SPIE 10612, Thirteenth International Conference on Correlation Optics, 1061216 (18 January 2018); https://doi.org/10.1117/12.2304849

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