Studying the impact of roughness on the sensitivity of Fabry-Pérot sensors for photoacoustic imaging

Marques, Dylan M.; Guggenheim, James A.; Zhang, Edward; Beard, Paul C.; Martín-Sánchez, David; Munro, Peter

doi:10.1117/12.2582081

Cited by 3 publications

(3 citation statements)

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“…Among different types of optical sensors, FP cavities are especially sensitive to aberrations as their sensing principle is dependent on the high spatial uniformity of the light beam to facilitate efficient interference. 4 It was previously shown that both beam and cavity aberrations, 5 surface roughness 6 as well as mirror non-parallelism 4 , 7 can lead to severe deterioration of the optical sensitivity of the FPI and that this loss can be partially recovered by the use of aberration correction techniques including adaptive optics. 8 An alternative method of aberration correction is based on spatial-mode-filtering 4 , 5 , 9 where a single-mode fiber 5 , 9 or an optical pinhole 4 is used to reject part of the interrogation light to improve the measurement sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Comparing free-space and fiber-coupled detectors for Fabry–Pérot-based all-optical photoacoustic tomography

Czuchnowski

Prevedel

2022

J. Biomed. Opt.

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. Significance: Highly sensitive detection is crucial for all-optical photoacoustic (PA) imaging. However, free-space optical detectors are prone to optical aberrations, which can degrade the pressure sensitivity and result in deteriorated image quality. While spatial mode-filtering has been proposed to alleviate these problems in Fabry–Pérot-based pressure sensors, their real functional advantage has never been properly investigated. Aim: We rigorously and quantitatively compare the performance of free-space and fiber-coupled detectors for Fabry–Pérot-based pressure sensors. Approach: We develop and characterize a quantitative correlative setup capable of simultaneous PA imaging using a free space and a fiber-coupled detector. Results: We found that fiber-coupled detectors are superior in terms of both signal level and image quality in realistic all-optical PA tomography settings. Conclusions: Our study has important practical implications in the field of PA imaging, as for most applications and implementations fiber-coupled detectors are relatively easy to employ since they do not require modifications to the core of the system but only to the peripherally located detector.

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Section: Introductionmentioning

confidence: 99%

Comparing free-space and fiber-coupled detectors for Fabry–Pérot-based all-optical photoacoustic tomography

Czuchnowski

Prevedel

2022

J. Biomed. Opt.

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“…Among different types of optical sensors FP cavities are especially sensitive to aberrations as their sensing principle is dependent on high spatial uniformity of the light beam to facilitate efficient interference [4]. It was previously shown that both beam and cavity aberrations [5], surface roughness [6] as well as mirror nonparallelism [4,7] can lead to severe deterioration of the optical sensitivity of the FPI, and that this loss can be partially recovered by the use of aberration correction techniques including Adaptive Optics [8]. An alternative method of aberration correction is based on spatial-mode-filtering [5,9] where higher order spatial modes are removed from the beam with the use of a single-mode fibre coupled decector (FCD).…”

Section: Introductionmentioning

confidence: 99%

Comparing free-space and fibre-coupled detectors for Fabry-Pérot based all-optical photoacoustic tomography

Czuchnowski¹,

Prevedel²

2021

Preprint

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All-optical ultrasound detection bears unique advantages for photoacoustics, including wider detection bandwidth, higher signal-to-noise per unit area and lower susceptibility to electromagnetic noise. These benefits have established optical ultrasound detection as a key method for photoacoustic applications in biology and medicine. However, the use of free-space detectors renders this approach sensitive to optical aberrations, which can degrade the pressure sensitivity and result in deteriorated image quality. While spatial mode-filtering through fibers has been proposed to alleviate these problems in Fabry-Pérot based pressure sensors, their real functional advantage has never been properly investigated. In this paper we rigorously and quantitatively compare the performance of free-space and fibre-coupled detectors in a custom correlative setup. We demonstrate the superiority of the latter in terms of both signal level and image quality in realistic all-optical photoacoustic tomography settings.

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“…However, a comprehensive picture on the performance of FP pressure sensors is still missing. Recent work in the field focused on the effects that surface roughness [4], mirror parallelism [5] as well as optical aberrations [6] have on the shape and sensitivity of the inteferometer transfer function (ITF) of a FP pressure sensor. Here we extend this work by investigating the often present asymmetry in the ITF of FP pressure sensors as well as explaining the origins of this phenomenon and methods for tackling it's effects under experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Transfer function asymmetry in Fabry-Pérot based optical pressure sensors

Czuchnowski¹,

Prevedel²

2021

Preprint

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Optical resonators are one of the most promising optical devices for manufacturing highperformance pressure sensors for photoacoustic imaging. Among these, Fabry-Pérot (FP) based pressure sensors have been successfully used for a multitude of applications. However, critical performance aspects of FP based pressure sensors have not been extensively studied, including the effects system parameters such as beam diameter and cavity misalignment have on transfer function shape. Here, we discuss the possible origins of the transfer function asymmetry, the impact it has on measurement sensitivity as well as ways to correctly estimate the FP pressure sensitivity under practical experimental conditions.

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Studying the impact of roughness on the sensitivity of Fabry-Pérot sensors for photoacoustic imaging

Cited by 3 publications

References 0 publications

Comparing free-space and fiber-coupled detectors for Fabry–Pérot-based all-optical photoacoustic tomography

Comparing free-space and fiber-coupled detectors for Fabry–Pérot-based all-optical photoacoustic tomography

Comparing free-space and fibre-coupled detectors for Fabry-Pérot based all-optical photoacoustic tomography

Transfer function asymmetry in Fabry-Pérot based optical pressure sensors

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