Maximum achievable sensitivity of the fiber optic evanescent field absorption sensor based on the U-shaped probe

Khijwania, Sunil K.; Gupta, Banshi D.

doi:10.1016/s0030-4018(00)00465-x

Cited by 71 publications

(37 citation statements)

References 5 publications

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“…The sensitivity of an optical fiber evanescent wave absorption sensor has been found to increase either by tapering or by making a U shaped probe [46,79]. In both the cases, the evanescent field of the guided light extends more in the sensing region, leading to increased absorbance, and hence sensitivity.…”

Section: Enhancement Of Performancementioning

confidence: 99%

Fiber Optic Plasmonic Sensors: Past, Present and Future

Srivastava¹

2013

TOOPTSJ

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Abstract:We review various fiber optic sensors utilizing both the propagating and localized surface plasmon resonance techniques. The utilization of optical fibers in plasmon based sensing has provided several advantages in sensing of various physical, chemical and biochemical parameters. The article starts with a brief introduction of the propagating surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR), presents the review of some of the past studies on SPR and LSPR based state-of-the-art fiber optic sensors and finally ends with the future scope of the plasmonics based fiber optic sensors. In addition, we discuss some latest results on the plasmon enhanced whispering gallery mode sensors, which require tapered optical fibers for excitation. The present review may provide the researchers a rigorous and organized literature for the understanding of the basics, utility and trends of fiber optic plasmonic sensor in a chronological order.

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Section: Enhancement Of Performancementioning

confidence: 99%

Fiber Optic Plasmonic Sensors: Past, Present and Future

Srivastava¹

2013

TOOPTSJ

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“…Gupta [43], the sensitivity of the fiber optic evanescent field absorption sensor based on a U-shaped probe increases with the decrease in the bending radius of the probe. The increment occurs up to a certain value of the bending radius which depends on the fiber numerical aperture and core diameter.…”

Section: The Evanescent Wave In Optical Fibersmentioning

confidence: 99%

Optical fiber humidity sensor based on evanescent-wave scattering

et al. 2004

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An optical fiber humidity sensor has been devised using a porous sol-gel silica (PSGS) coating as a transducer. Evanescent wave scattering (EWS) in the PSGS coating. PSGS particles are highly hydrophilic and have a strong tendency to absorb water molecules from the surrounding environment. The absorbed water molecules form a thin layer on the inner surface of the pores inside the porous silica and enhance EWS, from which an indicatory signal can be obtained. The humidity sensor presented in this thesis has a fast response, is reversible, low cost, and has a broad dynamic relative humidity range from 3.6×10 -6 % to 100% or humidity range from 1.2ppm to 30000ppm. Because of its multiple advantages, including immunity to electromagnetic interference, resistance to corrosive environments, and high sensitivity, this humidity sensor has various applications. In soil moisture sensing, this humidity sensor can avoid the interference caused by compounds in soil water. For electrical transformer moisture sensing, this humidity sensor can avoid the effect of electromagnetic fields.ii DEDICATION I would like to dedicate

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“…Further, the geometry of the fiber optic probes could be modified to obtain a compact U-bent [3] sensing region, which not only minimizes the probe form factor but also significantly increases the evanescent field strength and/or its depth of penetration into the surrounding medium and thus improves the sensitivity [4]. The advantages of U-bent fibers include very efficient optical excitation of noble metal nanostructures bound to the decladded fiber probe surface and highly efficient and repeatable absorbance sensing which are useful for localized surface plasmon resonance (LSPR) or surface enhanced Raman scattering (SERS) based sensing [5].…”

Section: Introductionmentioning

confidence: 99%

PMMA Surface Functionalization Using Atmospheric Pressure Plasma for Development of Plasmonically Active Polymer Optical Fiber Probes

Vasanthakumari

Sai

Klages

2016

Plasma Chem Plasma Process

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In this paper, we demonstrate the development of plasmonically active PMMA optical fiber probes by the attachment of gold nanoparticles to the probe surface functionalized by means of flowing post-discharges from dielectric barrier discharge (DBD) plasmas for the first time. Polymer optical fiber (POF) probes (U shape to improve absorbance sensitivity) were subjected to reactive gas atmospheres in the post-discharge region of a coaxial DBD plasma reactor run at atmospheric pressure in different gases (Ar, Ar ? 10 % O 2 , O 2 , N 2 , N 2 ? 0.5 % H 2 ). Plasma treatments in Ar or N 2 gave rise to waterstable electrophilic functional groups on PMMA surface, whereas the amine groups generated by N 2 -containing plasmas were not stable. Subsequently, PMMA surfaces were treated with hexamethylene diamine (HMDA) to obtain stable amine groups through the reaction of electrophilic groups. Gold nanoflowers (AuNF, 37 nm, peak 570 nm) binding to the amine functionalized fiber probes was monitored in real-time by recording the optical absorbance changes at 570 nm with the help of a UV-vis spectrometer. Absorbance response from Ar or N 2 plasma treated probes are 100 and 60 times, respectively, that of untreated control probes. A 25 fold improvement in absorbance response was obtained for Ar plasma treated POF in comparison with only HMDA treated POF. The shelf life of the hence fabricated plasmonically active probes was found to be at least 3 months. In addition, plasmonic activity of U-bent fiber probes treated in Ar plasma is better than the conventional wet-chemical activation by environmentally hazardous acid pre-treatment approaches.Electronic supplementary material The online version of this article (

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Maximum achievable sensitivity of the fiber optic evanescent field absorption sensor based on the U-shaped probe

Cited by 71 publications

References 5 publications

Fiber Optic Plasmonic Sensors: Past, Present and Future

Fiber Optic Plasmonic Sensors: Past, Present and Future

Optical fiber humidity sensor based on evanescent-wave scattering

PMMA Surface Functionalization Using Atmospheric Pressure Plasma for Development of Plasmonically Active Polymer Optical Fiber Probes

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