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Article Dans Une Revue Optics Letters Année : 2014

Improving photoacoustic-guided optical focusing in scattering media by spectrally filtered detection

Résumé

We study the potential of photoacoustic guidance for light focusing through scattering samples via wavefront-shaping and iterative optimization. We experimentally demonstrate that the focusing efficiency on an extended absorber can be improved by iterative optimization of the high frequency components of the broadband photoacous-tic signal detected with a spherically focused transducer. We demonstrate more than 12-fold increase in the photoacoustic signal generated by a 30 μm wire using a narrow frequency band around 60 MHz. By monitoring the speckle pattern evolution during the optimization process with a CCD camera, we experimentally confirm that such optimization leads to a smaller optical focus than what would be obtained by optimizing lower frequencies of the photoacoustic feedback.
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Dates et versions

hal-01974520 , version 1 (10-12-2020)

Identifiants

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Thomas Chaigne, Ori Katz, Jérôme Gateau, Claude Boccara, Sylvain Gigan, et al.. Improving photoacoustic-guided optical focusing in scattering media by spectrally filtered detection. Optics Letters, 2014, 39 (20), pp.6054. ⟨10.1364/ol.39.006054⟩. ⟨hal-01974520⟩
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