Time reversal of photoacoustic waves
Abstract
In this work, the authors use the photoacoustic effect to create a source for ultrasonic time-reversal experiments. Photoacoustic waves were generated by an optically absorbing gel sphere excited by a laser pulse in a highly optically diffusive solution and recorded with an ultrasound array controlled by a time-reversal electronics. The emission of the time-reversed photoacoustic waves allowed the refocusing of the ultrasound towards the optical absorber, in particular, in the presence of a strongly acoustically defocusing medium. The authors illustrate how the technique can be applied to perform acoustical imaging in the presence of a strong acoustical aberration.
- Publication:
-
Applied Physics Letters
- Pub Date:
- October 2006
- DOI:
- 10.1063/1.2382732
- Bibcode:
- 2006ApPhL..89r4108B
- Keywords:
-
- 43.35.Ud;
- 43.58.-e;
- 43.38.-p;
- Thermoacoustics high temperature acoustics photoacoustic effect;
- Acoustical measurements and instrumentation;
- Transduction;
- acoustical devices for the generation and reproduction of sound