Ultrasonic subwavelength phase conjugated mirror with a layer of bubbles

•A subwavelength phase conjugated mirror using the non linearity of the bubbles is proposed.•The reflected beam of this mirror is observed to travels back along the same way as the incident beam.•A perturbative second-order theory describes quantitatively the experimental observations. A single laye...

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Published inUltrasonics Vol. 78; pp. 110 - 114
Main Authors Lombard, O., Barrière, C., Leroy, V.
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.07.2017
Subjects
Bubbly medium
Nonlinear acoustics
Phase conjugation
Bubbly medium
Nonlinear acoustics
Phase conjugation
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Summary:•A subwavelength phase conjugated mirror using the non linearity of the bubbles is proposed.•The reflected beam of this mirror is observed to travels back along the same way as the incident beam.•A perturbative second-order theory describes quantitatively the experimental observations. A single layer of gas bubbles in a yield-stress fluid is experimentally shown to behave as a phase-conjugated (PC) mirror with a thickness 250 times smaller than the wavelength (0.14mm-diameter bubbles for phase-conjugation at 40kHz). A high amplitude pump wave at frequency 80kHz interacts with a lower amplitude probe wave centered at 40kHz. A PC-reflection coefficient of 0.15 is obtained for a 50kPa pump. A perturbative second-order theory is shown to quantitatively describe the experimental observations.
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ISSN:0041-624X
1874-9968
DOI:10.1016/j.ultras.2017.03.008