28 February 2008 Integrated waveguide sensor for acoustic wave detection in photoacoustic tomography
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Photoacoustic tomography (PAT) with integrating line detectors is able to overcome resolution limitations that are caused by finite aperture sensors commonly used for acoustic wave detection. As integrating line detectors currently different types of sensors are used, e.g., a strip of PVDF film, a free propagating optical beam as a part of a Mach-Zehnder interferometer or an optical fiber interferometer. However, neither satisfies the conditions for an ideal sensor for PAT, which are high noise immunity, compactness, the possibility of parallel detection, and the sufficient resolution and sensitivity. Integrated waveguides (IWGs) in combination with some kind of an interferometer are less investigated for use as an acoustic sensor. An arriving acoustic pulse modifies not only the optical properties but also the dimensions of the waveguide. This leads to a change of phase of guided modes, which is converted into a modulation of light intensity by an interferometer. The topic of this study is the fabrication and testing of IWG sensors for their application in PAT. Free and guided beam detection methods in combination with a Mach-Zehnder interferometer are compared and the sensitivity of the sensors is derived theoretically and experimentally.
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R. Nuster, R. Nuster, G. Paltauf, G. Paltauf, H. Ditlbacher, H. Ditlbacher, P. Burgholzer, P. Burgholzer, } "Integrated waveguide sensor for acoustic wave detection in photoacoustic tomography", Proc. SPIE 6856, Photons Plus Ultrasound: Imaging and Sensing 2008: The Ninth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, 68560E (28 February 2008); doi: 10.1117/12.763090; https://doi.org/10.1117/12.763090

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