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Related Experiment Video

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Three-dimensional Optical-resolution Photoacoustic Microscopy
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Liquid lens using acoustic radiation force.

Daisuke Koyama1, Ryoichi Isago, Kentaro Nakamura

  • 1Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama, Japan. dkoyama@sonic.pi.titech.ac.jp

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|March 25, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces an acoustic liquid lens without moving parts, utilizing ultrasound to dynamically adjust focus. Optimized silicone oil achieved rapid response times for variable-focus applications.

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Area of Science:

  • Optics and Photonics
  • Fluid Dynamics
  • Acoustics

Background:

  • Traditional lenses often rely on mechanical components, limiting their speed and durability.
  • Developing novel optical systems with rapid, electronically controlled focal length adjustment is a key challenge.

Purpose of the Study:

  • To propose and demonstrate a novel liquid lens system actuated by acoustic radiation force.
  • To investigate the dynamic control of the liquid-air interface shape for variable focusing.
  • To optimize material properties for minimized lens response times.

Main Methods:

  • A liquid lens cell was designed using immiscible liquids (water and silicone oil) and an ultrasound transducer.
  • Acoustic standing waves were generated to deform the liquid interface, observed via optical coherence tomography (OCT).
  • Ray-tracing simulations were performed using OCT data to analyze beam focusing capabilities.

Main Results:

  • The liquid lens demonstrated tunable focusing by varying acoustic radiation force, controlled by input voltage.
  • Optimizing silicone oil viscosity (200 cSt) yielded response times of 40 ms (on) and 80 ms (off).
  • Experimental OCT results were validated by ray-tracing simulations, confirming beam focusing.

Conclusions:

  • The proposed acoustic liquid lens offers a mechanically contactless method for variable focusing.
  • The system shows potential for applications requiring fast optical adjustments without moving parts.
  • Further optimization of liquid properties and acoustic parameters could enhance performance.