Colchester, R;
Alles, E;
Desjardins, A;
(2019)
A Directional Fibre Optic Ultrasound Transmitter Based on a Reduced Graphene Oxide and Polydimethylsiloxane Composite.
Applied Physics Letters
, 114
(11)
10.1063/1.5089750.
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Abstract
Strongly directional ultrasound sources are desirable for many minimally invasive applications, as they enable high-quality imaging in the presence of positioning uncertainty. All-optical ultrasound is an emerging paradigm that exhibits high frequencies, large bandwidths, and a strong miniaturisation potential. Here, we report the design, modelling, and fabrication of a highly directional fibre-optic ultrasound transmitter that uses a composite of reduced graphene oxide and polydimethylsiloxane as the optical ultrasound generator. The ultrasound transmitter, which had an outer diameter of just 630 lm, generated ultrasound with a pressure exceeding 0.4 MPa for axial distances up to 16 mm, at a large bandwidth of 24.3 MHz. The ultrasound beam exhibited low divergence, with a beam diameter ranging between 0.6 and 2.1 mm for distances between 0 and 16 mm. The presented directional optical ultrasound source is hence well-suited to high-resolution interventional imaging.
| Type: | Article |
|---|---|
| Title: | A Directional Fibre Optic Ultrasound Transmitter Based on a Reduced Graphene Oxide and Polydimethylsiloxane Composite |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/1.5089750 |
| Publisher version: | https://doi.org/10.1063/1.5089750 |
| Language: | English |
| Additional information: | Licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10069765 |
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