Characteristics of optimized fibre-optic ultrasound receivers for minimally invasive photoacoustic detection

Edward Z. Zhang; Paul C. Beard

doi:10.1117/12.2081904

11 March 2015 Characteristics of optimized fibre-optic ultrasound receivers for minimally invasive photoacoustic detection

Edward Z. Zhang, Paul C. Beard

Author Affiliations +

Proceedings Volume 9323, Photons Plus Ultrasound: Imaging and Sensing 2015; 932311 (2015) https://doi.org/10.1117/12.2081904
Event: SPIE BiOS, 2015, San Francisco, California, United States

Abstract

A range of miniature (125μm o.d.) fibre optic ultrasound sensors based on the use of interferometric polymer optical cavities has been developed for minimally invasive photoacoustic imaging and sensing applications. It was observed that by careful selection of both the fibre tip and cavity geometry it is possible to achieve exceptional acoustic performance. Specifically, rounding the tip of the fibre to remove the presence of sharp diffractive boundaries enables a well behaved frequency response along with a near omnidirectional response at frequencies in the tens of MHz range to be achieved. The use of a plano-convex rather than a planar cavity provides high finesse and therefore detection sensitivity. Thus, by using a plano-convex cavity formed at the tip of radiused single mode fibre it was possible to realise a miniature ultrasound detector with a bandwidth of 80MHz, a noise-equivalent pressure of 40Pa (over a 20MHz measurement bandwidth) and a near omnidirectional response at frequencies as high as 30MHz. These characteristics suggest this type of sensor could find applications in interventional medicine for guiding needles or catheters, as mechanically scanned photoacoustic imaging probes or in laser scanning OR-PAM.

Citation Download Citation

Edward Z. Zhang and Paul C. Beard "Characteristics of optimized fibre-optic ultrasound receivers for minimally invasive photoacoustic detection", Proc. SPIE 9323, Photons Plus Ultrasound: Imaging and Sensing 2015, 932311 (11 March 2015); https://doi.org/10.1117/12.2081904

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available