Rajagopal, S; Treeby, B E; Cox, B T (2018) Effect of Backing on Carbon-Polymer Nanocomposite Sources for Laser Generation of Broadband Ultrasound Pulses. In: 2018 IEEE International Ultrasonics Symposium, 22-25 October 2018, Kobe, Japan.

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Abstract

Light absorbing polymer nanocomposites have been widely investigated as a source of broadband and high amplitude ultrasound generated via pulsed laser excitation. Biomedical application of such sources includes both imaging and ablative therapies. Fabrication of light absorbing nanocomposite sources has mostly involved elaborate chemistry. Here, a nanocomposite composed of multi-walled carbon nanotubes mechanically dispersed in polydimethylsiloxane polymer is used. The nanocomposite film was backed on optically clear polydimethylsiloxane and laboratory grade glass slide. The two backed sources were investigated using two lasers whose full-width half maximum durations were 2.6 and 4.0 ns. It was found that the characteristics of the acoustic field generated from the nanocomposite source showed a significant dependence on the backing when the stress confinement criterion is not satisfied.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	Acoustics > Ultrasound
Divisions:	Chemical, Medical & Environmental Science
Identification number/DOI:	10.1109/ULTSYM.2018.8579784
Last Modified:	12 Feb 2019 15:29
URI:	https://eprintspublications.npl.co.uk/id/eprint/8284