• Advanced Photonics Nexus
  • Vol. 2, Issue 5, 056006 (2023)
Yu-Hang Liu1,2, Alexey Kurnikov3, Weiye Li1,2, Pavel Subochev3, and Daniel Razansky1,2,*
Author Affiliations
  • 1University of Zurich, Institute of Pharmacology and Toxicology and Institute for Biomedical Engineering, Faculty of Medicine, Zurich, Switzerland
  • 2ETH Zurich, Institute for Biomedical Engineering, Department of Information Technology and Electrical Engineering, Zurich, Switzerland
  • 3Russian Academy of Sciences, Institute of Applied Physics, Nizhny Novgorod, Russia
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    DOI: 10.1117/1.APN.2.5.056006 Cite this Article Set citation alerts
    Yu-Hang Liu, Alexey Kurnikov, Weiye Li, Pavel Subochev, Daniel Razansky, "Highly sensitive miniature needle PVDF-TrFE ultrasound sensor for optoacoustic microscopy," Adv. Photon. Nexus 2, 056006 (2023) Copy Citation Text show less

    Abstract

    A wideband sensitive needle ultrasound sensor based on a polarized PVDF-TrFE copolymer piezoelectric film has been developed, which is capable of providing a noise equivalent pressure of 14 Pa and a uniform frequency response ranging from 1 to 25 MHz. Its high sensitivity (1.6 μV / Pa) and compact size were achieved by capitalizing on the large electromechanical coupling coefficient of PVDF-TrFE and minimizing parasitic capacitance in a two-stage amplifier structure. The detection sensitivity of the newly designed sensor outperformed commercially available hydrophones with an equivalent sensing element area by a factor of 9. The sensor has been successfully integrated into a light scanning optoacoustic microscopy (OAM) system with a limited working space. Submicrometer resolution images were subsequently attained from living mice without employing signal averaging. The miniature sensor design can readily be integrated into various OAM systems and further facilitate multimodal imaging system implementations.
    NEP=22  μV1.6  μV/Pa14  Pa.

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    Yu-Hang Liu, Alexey Kurnikov, Weiye Li, Pavel Subochev, Daniel Razansky, "Highly sensitive miniature needle PVDF-TrFE ultrasound sensor for optoacoustic microscopy," Adv. Photon. Nexus 2, 056006 (2023)
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