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Development of tuneable Fabry-Pérot sensors for parallelised photoacoustic signal acquisition
Author(s): Claus Villringer; Taravat S. Gilani; Edward Zhang; Silvio Pulwer; Patrick Steglich; Sigurd Schrader; Jan Laufer
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Paper 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.

Paper Details

Date Published: 8 March 2019
PDF: 6 pages
Proc. SPIE 10878, Photons Plus Ultrasound: Imaging and Sensing 2019, 108780M (8 March 2019); doi: 10.1117/12.2509437
Show Author Affiliations
Claus Villringer, Technical Univ. of Applied Sciences Wildau (Germany)
Martin-Luther-Univ. Halle-Wittenberg (Germany)
Taravat S. Gilani, Martin-Luther-Univ. Halle-Wittenberg (Germany)
Edward Zhang, Univ. College London (United Kingdom)
Silvio Pulwer, Technical Univ. of Applied Sciences Wildau (Germany)
Patrick Steglich, Technical Univ. of Applied Sciences Wildau (Germany)
IHP - Leibniz-Institut für innovative Mikroelektronik (Germany)
Sigurd Schrader, Technical Univ. of Applied Sciences Wildau (Germany)
Jan Laufer, Martin-Luther-Univ. Halle-Wittenberg (Germany)


Published in SPIE Proceedings Vol. 10878:
Photons Plus Ultrasound: Imaging and Sensing 2019
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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