Ultimate resolution for refractometric sensing with whispering gallery mode microcavities

Silverstone, Joshua W.; McFarlane, S.; Manchee, C. P. K.; Meldrum, A.

doi:10.1364/oe.20.008284

Cited by 53 publications

(37 citation statements)

References 33 publications

(46 reference statements)

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“…Indeed, the resonance spectra measured here (shown later in Fig. 6) exhibit peaks skewed to short λ , a result of cylindrical resonator skew rays [12,25]. Nonetheless, as shown in § 4, the β = 0 resonances from Eq.…”

Section: Resonances and Mode Theorysupporting

confidence: 49%

Fluorescent polymer coated capillaries as optofluidic refractometric sensors

Rowland¹,

François²,

Hoffmann³

et al. 2013

Opt. Express

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Section: Resonances and Mode Theorysupporting

confidence: 49%

Fluorescent polymer coated capillaries as optofluidic refractometric sensors

Rowland¹,

François²,

Hoffmann³

et al. 2013

Opt. Express

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“…50 nm/RIU, the detection limits for heavy oils are on the order of 10 À4 RIU, assuming 10 pm spectral resolution is achievable via Fourier methods [28]. The results show that this sensor structure can be used for viscous heavy oils.…”

Section: Discussionmentioning

confidence: 86%

Refractometric Sensing of Heavy Oils in Fluorescent Core Microcapillaries

Zamora

Zhang

Meldrum

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-La de´tection re´fractome´trique des huiles lourdes dans les microcapillaires a`coeur fluorescents -La de´tection par re´fractome´trie d'huiles lourdes calibre´es (densite´> 1 000 kg/m 3 ) a e´te´de´montre´e à l'aide de micro-capillaires a`coeurs fluorescents. La surface interne d'un capillaire de 25 microns a d'abord e´te´reveˆtue d'une couche de silicium fluorescent a`haut indice de re´fraction (fluorescent silicon Quantum Dots, QD). Ce film de QD permet le de´veloppement de re´sonances cylindriques en mode galerie (Whispering Gallery Mode, WGM) à l'inte´rieur du capillaire. Les huiles lourdes recouvrant une gamme e´tendue de l'indice de re´fraction ont e´teí njecte´es dans le canal du capillaire, provoquant de grands changements pour les longueurs d'onde de re´sonance WGM. La sensibilite´des huiles lourdes aux indices de re´fraction les plus e´leve´s, est d'environ 250 nm par Unite´d'Indice de Re´fraction (nm/UIR), ce qui est la sensibilite´la plus e´leve´e observe´e jusqu'à pre´sent pour un capteur re´fractome´trique fonctionnant en mode fluorescent. Cela est une indication que les microcapillaires a`coeurs fluorescents pourraient eˆtre une alternative viable par microfluidique pour la de´tection chimique ou par re´fractome´trie lors des divers stades de la transformation, du controˆle et de l'utilisation du pe´trole et du gaz.Abstract -Refractometric Sensing of Heavy Oils in Fluorescent Core Microcapillaries -The refractometric sensing of calibrated heavy oils (density > 1 000 kg/m 3 ) is demonstrated using fluorescent-core microcapillaries. A 25-micron capillary channel was first coated with a high-index layer of fluorescent silicon Quantum Dots (QD). This QD film supports the development of cylindrical Whispering Gallery Mode (WGM) resonances inside the capillary. Heavy oils spanning a wide range of refractive index were pumped into the capillary channel, causing large shifts in the fluorescence WGM resonant wavelengths. The sensitivity for heavy oils approached 250 nm per Refractive Index Unit (nm/RIU) at the higher oil indices, which is the highest sensitivity so far observed for a refractometric sensor operating in the fluorescence mode. This suggests that fluorescent core microcapillaries may be a viable microfluidic alternative for refractometric or chemical sensing in various stages of oil and gas processing, monitoring and usage.

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“…Unfortunately, there is no function that will fit a distribution of overlapping Lorentzians from the spiraling WGMs. In previous work 16 we suggested that a skewed Lorentzian 17 would give a better fit:…”

Section: Discussionmentioning

confidence: 97%

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

McFarlane

Manchee

Silverstone

et al. 2013

JoVE

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This paper discusses fluorescent core microcavity-based sensors that can operate in a microfluidic analysis setup. These structures are based on the formation of a fluorescent quantum-dot (QD) coating on the channel surface of a conventional microcapillary. Silicon QDs are especially attractive for this application, owing in part to their negligible toxicity compared to the II-VI and II-VI compound QDs, which are legislatively controlled substances in many countries. While the ensemble emission spectrum is broad and featureless, an Si-QD film on the channel wall of a capillary features a set of sharp, narrow peaks in the fluorescence spectrum, corresponding to the electromagnetic resonances for light trapped within the film. The peak wavelength of these resonances is sensitive to the external medium, thus permitting the device to function as a refractometric sensor in which the QDs never come into physical contact with the analyte. The experimental methods associated with the fabrication of the fluorescent-core microcapillaries are discussed in detail, as well as the analysis methods. Finally, a comparison is made between these structures and the more widely investigated liquid-core optical ring resonators, in terms of microfluidic sensing capabilities. Video LinkThe video component of this article can be found at

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Ultimate resolution for refractometric sensing with whispering gallery mode microcavities

Cited by 53 publications

References 33 publications

Fluorescent polymer coated capillaries as optofluidic refractometric sensors

Fluorescent polymer coated capillaries as optofluidic refractometric sensors

Refractometric Sensing of Heavy Oils in Fluorescent Core Microcapillaries

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

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