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Fabrication and Operation of Acoustofluidic Devices Supporting Bulk Acoustic Standing Waves for Sheathless Focusing of Particles

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Compact, high-speed variable-focus liquid lens using acoustic radiation force.

Daisuke Koyama¹, Ryoichi Isago, Kentaro Nakamura

¹Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259-R2-26 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan. dkoyama@sonic.pi.titech.ac.jp

|December 18, 2010

Summary

This summary is machine-generated.

This study introduces a fast, variable-focus liquid lens using acoustic radiation force. The novel design achieves a rapid 6.7 ms response time, enabling dynamic optical adjustments.

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Area of Science:

Optics and Photonics
Acoustics
Materials Science

Background:

Traditional lenses have fixed focal lengths, limiting dynamic focusing capabilities.
Developing adaptive optical elements is crucial for advanced imaging and optical systems.

Purpose of the Study:

To propose and demonstrate a compact, high-speed liquid lens with variable focus.
To investigate the use of acoustic radiation force for dynamic interface manipulation in a liquid lens.

Main Methods:

Fabrication of a liquid lens using an aluminum cell, piezoelectric transducer, degassed water, and silicone oil.
Application of acoustic radiation force to alter the oil-water interface profile.
Development of a theoretical spring-mass-dashpot model for lens vibration analysis.
Finite element analysis to determine sound pressure distribution and acoustic standing wave generation.

Main Results:

Successful operation of a variable-focus liquid lens driven by acoustic radiation force.
Achieved a fastest response time of 6.7 ms using silicone oil with 100 cSt kinematic viscosity.
Finite element analysis confirmed the generation of an acoustic standing wave within the lens structure.

Conclusions:

The proposed liquid lens offers a high-speed, compact solution for variable focusing.
Acoustic radiation force is an effective mechanism for rapid interface control in liquid lenses.
The developed theoretical model and simulation methods provide insights into the lens's operational dynamics.