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An optical ultrasound generator was used to perform broadband (2–35 MHz) acoustical characterisation measurements of a nanocomposite comprising carbon nanotubes (CNT) and polydimethylsiloxane (PDMS), a composite that is commonly used as optical ultrasound generator. Samples consisting of either pure PDMS or CNT-loaded PDMS were characterised to determine the influence of CNTs on the speed of sound...
Optical ultrasound sources, which generate ultrasound photoacoustically, are promising alternatives to piezoelectric or capacitive transducers. Employing pulsed excitation light, high bandwidths (up to 100 MHz) and pressures (MPa range for unfocussed sources) have been achieved with materials that combine strong optical absorption with a high thermal expansion coefficient, such as carbon nanotube...
Compared with conventional piezoelectric transductions, an all-optical high-frequency ultrasound (HFUS) transducer is a promising modality for high-resolution ultrasound imaging. We demonstrate an all-optical HFUS transducer by integrating a carbon nanotube–polydimethylsiloxane composite film with an etalon thin-film structure incorporating SiO2/TiO2 distributed Bragg reflectors and an SU-8 resonator...
Ultrasound sensing was investigated with SU-8 polymer based Fabry-Perot interferometers consisting of TiO2/SiO2 distributed Bragg mirrors (DBRs). The DBRs are properly modified to transmit an excitation pulse laser (532 nm) generating ultrasound in all-optical transducers.
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