Optical fiber sensing with a low-finesse Fabry–Perot cavity

Santos, José Lúıs; Leite, Ângela; Jackson, David A.

doi:10.1364/ao.31.007361

Cited by 90 publications

(45 citation statements)

References 11 publications

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“…The method is based on the fact that the parallel plate plays a double role -it acts as a low finesse FP etalon for beam (II) and also provides an optical path difference between the two parts of the parallel beam. The intensity of beam (2) reflected from the plate is given by [12]:…”

Section: Methodsmentioning

confidence: 99%

Simultaneous thickness and group index measurement with a single arm low-coherence interferometer

Zílio¹

2014

Opt. Express

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Abstract:We present a single arm low-coherence interferometer to directly measure the physical thickness and group refractive index of optically transparent samples having flat and parallel surfaces. The optical arrangement, resembling a common-path interferometer, is more compact and stable than the usual dual-arm low-coherence interferometer. It has been used to measure samples of Herasil 102 fused silica, Schott B270 Superwhite crown glass and borosilicate cover glass. The results obtained indicate uncertainties in the third decimal place for index values and thicknesses accurate to within 2 μm.

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Section: Methodsmentioning

confidence: 99%

Simultaneous thickness and group index measurement with a single arm low-coherence interferometer

Zílio¹

2014

Opt. Express

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“…The relatively high refractive index of 1.98 for SiN allows the implementation of a sensor cavity with a strong optical resonance in saline or aqueous humor because the resonance amplitude of an optical cavity is heavily dependent on the reflectivity of its surfaces. If the reflectivity is too high or too low, the resonance may become very sharp or flat, which significantly lowers the SNR [80][81][82] . The thickness of the SiN membrane was optimized to maximize the amplitude of the sensor resonance.…”

Section: Design Of the Nanodot-enhanced Iop Sensormentioning

confidence: 99%

A microscale optical implant for continuous in vivo monitoring of intraocular pressure

Lee

Park

et al. 2017

Microsyst Nanoeng

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Intraocular pressure (IOP) is a key clinical parameter in glaucoma management. However, despite the potential utility of daily measurements of IOP in the context of disease management, the necessary tools are currently lacking, and IOP is typically measured only a few times a year. Here we report on a microscale implantable sensor that could provide convenient, accurate, ondemand IOP monitoring in the home environment. When excited by broadband near-infrared (NIR) light from a tungsten bulb, the sensor's optical cavity reflects a pressure-dependent resonance signature that can be converted to IOP. NIR light is minimally absorbed by tissue and is not perceived visually. The sensor's nanodot-enhanced cavity allows for a 3-5 cm readout distance with an average accuracy of 0.29 mm Hg over the range of 0-40 mm Hg. Sensors were mounted onto intraocular lenses or silicone haptics and secured inside the anterior chamber in New Zealand white rabbits. Implanted sensors provided continuous in vivo tracking of short-term transient IOP elevations and provided continuous measurements of IOP for up to 4.5 months.

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“…In addition, the implications of the utilization of low-finesse Fabry-Pérot cavity as a sensing element were addressed when its transfer function was approximated to that of a two-beam interferometer. The reading errors that arose from this approach had been quantified for several processing schemers [8].…”

Section: "Incubation" Periodmentioning

confidence: 99%

Optical fiber sensors: a route from University of Kent to Portugal

Santos

Ribeiro

2011

Photonic Sens

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In this work the authors first summarily describe the main topics that were the subject of their post-graduate activity in fiber sensing at the Applied Optics Group of University of Kent in the late 1980s and early 1990s. After their return to Porto, Portugal, the know-how acquired during their stay at Kent and the collaboration paths that followed between the University of Porto and University of Kent were instrumental in the start-up and progress of optical fiber sensing activity in Portugal. The main topics addressed in this field, the description of some of the relevant developments achieved in recent years, the present situation and the guidelines for the future research and development activity in Portugal in fiber sensing will be the core of this work.

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Optical fiber sensing with a low-finesse Fabry–Perot cavity

Cited by 90 publications

References 11 publications

Simultaneous thickness and group index measurement with a single arm low-coherence interferometer

Simultaneous thickness and group index measurement with a single arm low-coherence interferometer

A microscale optical implant for continuous in vivo monitoring of intraocular pressure

Optical fiber sensors: a route from University of Kent to Portugal

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