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Proceedings Paper

Performance improvement of an all-optical Fabry Perot ultrasound detector
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Paper Abstract

A highly sensitive Fiber-Optic Fabry Perot Ultrasound sensor with a self-written waveguide is presented in this work. A simulated device using Gold mirrors showed periodic resonance with Q-factor 1900 for 45 μm thick devices. Including a waveguide to limit lateral power losses resulted in improvement of Q-factor to 3200. Simulations also indicated greater improvement in Q-factor upon the introduction of waveguide with larger device thicknesses.

Subsequently, a prototype was fabricated on a single mode optical fiber. Benzocyclobutene was chosen as the cavity medium as it undergoes a refractive index change upon exposure to UV. The refractive index change in BCB upon UV exposure was studied using a phase grating. Upon confirming that 2-hour exposure produced a change of 0.004, a self-aligned waveguide was written into the cavity. A consequent increase in Q-factor from 2500 to 5200 was seen for an 80 μm thick device.

Simulation studies indicate further improvement when incorporating dielectric Bragg mirrors instead of Gold, with Q-factors of 6400 and 10200 with and without the waveguide. Therefore, the proposed design includes Dielectric Bragg mirrors as well as a self-aligned waveguide.

The fabrication techniques being fairly controlled and automated, this device is highly suitable for mass-manufacturing, making is possible to produce as an inexpensive, disposable device. A potential application is to integrate it within a commercial guidewire to create a smart guidewire capable of detecting vascular vessel walls in order to guide interventions for Chronic Total Occlusions, reducing risk of wall perforation, which is currently an unmet clinical need.

Paper Details

Date Published: 28 February 2017
PDF: 6 pages
Proc. SPIE 10058, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII, 100580M (28 February 2017); doi: 10.1117/12.2250979
Show Author Affiliations
Supriya V. Thathachary, Univ. of Minnesota (United States)
Shai Ashkenazi, Univ. of Minnesota (United States)

Published in SPIE Proceedings Vol. 10058:
Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII
Israel Gannot, Editor(s)

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