Villringer, C;
Gilani, TS;
Zhang, E;
Pulwer, S;
Steglich, P;
Schrader, S;
Laufer, J;
(2019)
Development of tuneable Fabry-Perot sensors for parallelised photoacoustic signal acquisition.
In: Oraevsky, AA and Wang, LV, (eds.)
Photons Plus Ultrasound: Imaging and Sensing 2019.
SPIE: San Francisco, CA, USA.
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Abstract
Fabry-Pérot (FP) sensors have enabled high resolution 3D photoacoustic (PA) imaging in backward mode. However, raster-scanning of the interrogation laser beam across the sensor can result in slow 3D image acquisition. To overcome this limitation, parallelized PA signal acquisition can be used for which FP sensors with uniform optical thickness are required. In this work, the optical thickness is tuned a) irreversibly through the use of a photopolymer host matrix and b) actively using embedded electro-optic (EO) chromophores. Polymer spacers (5 μm) were deposited using spin coating and sandwiched between two dielectric mirrors and transparent ITO electrodes. The employed polymer guest-host system consists of an EO chromophore (2-methyl-4-nitroaniline) and poly(vinyl cinnamate). EO tuneability was induced using contact poling and a tuneability of 68 pm was demonstrated. The optical thickness was homogenised by raster scanning a UV beam whilst varying the exposure time across a 4 mm2 detection aperture.
| Type: | Proceedings paper |
|---|---|
| Title: | Development of tuneable Fabry-Perot sensors for parallelised photoacoustic signal acquisition |
| Event: | Conference on Photons Plus Ultrasound - Imaging and Sensing |
| Location: | San Francisco, CA |
| Dates: | 03 February 2019 - 06 February 2019 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2509437 |
| Publisher version: | https://doi.org/10.1117/12.2509437 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Photoacoustic imaging, Fabry-Pérot polymer film sensors, tuneable Fabry-Pérot |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices 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/10123379 |
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