We have recently reported on a method to design at will the spatial profile of transmitted coherent light after propagation through a strongly scattering sample, exploiting wavefront shaping in combination with a transmission matrix approach. In this paper, we explore experimentally and theoretically the ability of this approach to generate foci whose full width at half maximum are smaller than the diffraction-limited speckle grain size, using (Bessels) beam variations implemented with virtual annular filters.
Antoine Boniface, Mickael Mounaix, Baptiste Blochet, Rafael Piestun, and Sylvain Gigan, "Sub-diffraction limit focusing through a complex medium by virtual Fourier filtering," Proc. SPIE 10073, Adaptive Optics and Wavefront Control for Biological Systems III, 1007309 (Presented at SPIE BiOS: January 28, 2017; Published: 22 February 2017); https://doi.org/10.1117/12.2251864.
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