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Updated: Nov 2, 2025

Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
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Acoustic hologram optimisation using automatic differentiation.

Tatsuki Fushimi1,2, Kenta Yamamoto3,4, Yoichi Ochiai3,5,6

  • 1R&D Center for Digital Nature, University of Tsukuba, Tsukuba, 305-8550, Japan. tfushimi@slis.tsukuba.ac.jp.

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Summary
This summary is machine-generated.

Diff-PAT, an acoustic hologram optimization platform, enhances acoustic system performance. This novel method, using only phase modulation, outperforms traditional amplitude and phase control for acoustic holograms.

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Area of Science:

  • Acoustics
  • Wave physics
  • Signal processing

Background:

  • Acoustic holograms are crucial for encoding 3D acoustic fields in 2D.
  • The quality of acoustic holograms directly impacts acoustic system performance.
  • Current optimization methods controlling only phase are considered less effective than those controlling both amplitude and phase.

Purpose of the Study:

  • To introduce Diff-PAT, an acoustic hologram optimization platform utilizing automatic differentiation.
  • To demonstrate that phase-only modulation can achieve superior performance compared to amplitude and phase modulation.
  • To present a versatile optimization platform applicable to various photoacoustic transducer (PAT) systems.

Main Methods:

  • Development of Diff-PAT, an optimization platform with automatic differentiation capabilities.
  • Evaluation of Diff-PAT's performance using 1000 random datasets for single-sided and single-axis arrays.
  • Application of Diff-PAT to a phase plate for performance assessment.

Main Results:

  • Diff-PAT, using only phase modulation, achieved better performance than conventional methods in optimizing output amplitude.
  • The platform demonstrated effectiveness across a range of control point configurations.
  • Application to a phase plate resulted in a >8 dB increase in peak noise-to-signal ratio.

Conclusions:

  • Diff-PAT offers a superior method for acoustic hologram optimization, even with phase-only modulation.
  • The platform is adaptable for diverse photoacoustic transducer applications without system modification.
  • Diff-PAT significantly enhances acoustic hologram quality, as evidenced by improved noise-to-signal ratio.