@inproceedings{SieversVillringerLebeketal.2023, author = {Sievers, Jan and Villringer, Claus and Lebek, Werner and Gilani, Taravat Saeb and Laufer, Jan}, title = {Photoacoustic tomography using a Fabry-Perot sensor with homogeneous optical thickness and wide-field camera-based detection}, series = {Opto-Acoustic Methods and Applications in Biophotonics VI}, booktitle = {Opto-Acoustic Methods and Applications in Biophotonics VI}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17850}, year = {2023}, abstract = {Fabry-Perot (FP) sensors are typically read out using a raster scan to acquire tomographic Photoacoustic (PA) images. To speed up the recording time, wide-field illumination of the sensor in combination with a camera as detector can be used. In this study, an sCMOS camera and wavelengths around 517 nm are used to interrogate a FP sensor with a homogeneous optical thickness over a 4 cm2 aperture. The recorded time series show PA signals are acquired over the entire area of the interrogation beam. The performance of the system, such as the noise equivalent pressure, is evaluated.}, language = {en} } @inproceedings{LebekHeyrothSyrowatkaetal.2023, author = {Lebek, Werner and Heyroth, Frank and Syrowatka, Frank and Villringer, Claus and Goerlitz, Sylvia and Laufer, Jan}, title = {Evaluation of fabrication methods for Fabry-Perot polymer film ultrasound sensors}, series = {Opto-Acoustic Methods and Applications in Biophotonics VI}, booktitle = {Opto-Acoustic Methods and Applications in Biophotonics VI}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17864}, year = {2023}, abstract = {Fabry-P{\`e}rot (FP) interferometer sensors enable highly sensitive backward mode acoustic detection in Photoacoustic (PA) imaging. They are transparent to the excitation wavelength, can be placed directly next to the PA source, and offer a broadband frequency response and high acoustic sensitivity. PA tomography using parallelized detection requires high spatial uniformity of the optical and acoustic properties, which can be hampered by contaminations during fabrication that lead to the formation of inhomogeneities and artefacts. The quality and homogeneity of the dielectric and polymer layers have a direct effect on the maximum optical phase sensitivity, and hence acoustic sensitivity. In this study, cross-sectional images of FP sensors were obtained using focused ion beam milling and ultramicrotomy followed by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) to evaluate different fabrication methods.}, language = {en} }