Polymer Waveguides for Improved Sensitivity in Fiber Fabry-Perot Ultrasound Detectors

Supriya V. Thathachary, Julia Howes, Shai Ashkenazi

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4 Scopus citations


This paper presents a fabrication method and results from optical and acoustic characterization of a miniature fiber Fabry-Perot ultrasound detector. A high Q-factor was achieved by creating a self-aligned polymer waveguide within the resonator cavity to restrict diffraction losses. As a result of the improved optical Q-factor upon introduction of the waveguide, a high acoustic sensitivity was achieved. The device presented in this paper demonstrates an optical resonator Q-factor of >2000, and a Noise Equivalent Pressure of 350 Pa over a 25MHz bandwidth on a 125μ m fiber with a 9μ m waveguide. Sensitivity can be further improved significantly with the use of dielectric mirrors. The high sensitivity of these waveguided fiber Fabry-Perot ultrasound detectors makes them suitable for detection of both ultrasound and photoacoustic signals, while their small size makes this technology suitable for adoption in applications requiring small form factor, such as in interventional cardiology.

Original languageEnglish (US)
Article number8984247
Pages (from-to)43-50
Number of pages8
JournalIEEE Sensors Journal
Issue number1
StatePublished - Jan 1 2021

Bibliographical note

Funding Information:
Manuscript received December 29, 2019; accepted January 28, 2020. Date of publication February 5, 2020; date of current version December 4, 2020. This work was supported in part by the Minnesota Nano Center under the National Science Foundation through the National Nano Coordinated Infrastructure Network (NNCI) under Award ECCS-1542202. The associate editor coordinating the review of this article and approving it for publication was Prof. Agostino Iadicicco. (Corresponding author: Supriya V. Thathachary.) The authors are with the Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455 USA (e-mail: thath001@umn.edu; howes042@umn.edu; ashke003@umn.edu). Digital Object Identifier 10.1109/JSEN.2020.2971696

Publisher Copyright:
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Copyright 2020 Elsevier B.V., All rights reserved.


  • Acoustic transducers
  • Fabry-Perot
  • fiber
  • imaging
  • intravascular imaging
  • optical ultrasound detection
  • optical waveguide
  • photoacoustics
  • piezoelectric
  • polymer waveguide
  • ultrasound detection
  • waveguide


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