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Improving photoacoustic-guided optical focusing in scattering media by spectrally filtered detection
Abstract : 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.
https://hal.archives-ouvertes.fr/hal-01974520
Contributor : Thomas Chaigne <>
Submitted on : Thursday, December 10, 2020 - 9:50:57 PM
Last modification on : Thursday, December 17, 2020 - 3:32:31 AM
Contributor : Thomas Chaigne <>
Submitted on : Thursday, December 10, 2020 - 9:50:57 PM
Last modification on : Thursday, December 17, 2020 - 3:32:31 AM
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1310.7535.pdf
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