15 March 2016 Structured adaptive focusing through scattering media
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The combined use of a wavefront modulator and a scattering medium forms an "opaque lens" which forces the light to focus tightly. The adaptive focus has the same shape as the correlation function of the original speckle pattern and it can be generated at defined positions with resolution up to hundreds of nanometers. We have demonstrated that manipulating the speckle pattern spatial components can structure the shape of the focus. Exploiting selectively spatial-frequencies from the speckle components we realized opaque lenses able to produce sub-correlation foci and Bessel beams.
Conference Presentation
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Diego Di Battista, Diego Di Battista, Daniele Ancora, Daniele Ancora, Haisu Zhang, Haisu Zhang, Krystalia Lemonaki, Krystalia Lemonaki, Stella Avtzi, Stella Avtzi, Stelios Tzortzakis, Stelios Tzortzakis, Marco Leonetti, Marco Leonetti, Giannis Zacharakis, Giannis Zacharakis, } "Structured adaptive focusing through scattering media", Proc. SPIE 9717, Adaptive Optics and Wavefront Control for Biological Systems II, 971719 (15 March 2016); doi: 10.1117/12.2211594; https://doi.org/10.1117/12.2211594

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