Optical Fiber Micro-Taper with Circular Symmetric Gold Coating for Sensor Applications Based on Surface Plasmon Resonance

Wieduwilt, Torsten; Kirsch, K.; Dellith, Jan; Willsch, Reinhardt; Bartelt, Hartmut

doi:10.1007/s11468-012-9432-7

Cited by 31 publications

(14 citation statements)

References 33 publications

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“…The fiber core also gets thinner by the same factor as the total fiber and eventually the evanescent wave from the core reaches the outer surface and is exposed to the surrounding medium. An SPR sensor results when a metallic layer is placed over the tapered region [28][29][30][31][32][33][34]. The ultimate refractometric sensitivity of such structures reaches 12,000 nm/RIU [29].…”

Section: Geometry-modified Fibersmentioning

confidence: 99%

Review of plasmonic fiber optic biochemical sensors: improving the limit of detection

2015

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This paper presents a brief overview of the technologies used to implement surface plasmon resonance (SPR) effects into fiber-optic sensors for chemical and biochemical applications and a survey of results reported over the last ten years. The performance indicators that are relevant for such systems, such as refractometric sensitivity, operating wavelength, and figure of merit (FOM), are discussed and listed in table form. A list of experimental results with reported limits of detection (LOD) for proteins, toxins, viruses, DNA, bacteria, glucose, and various chemicals is also provided for the same time period. Configurations discussed include fiber-optic analogues of the Kretschmann-Raether prism SPR platforms, made from geometry-modified multimode and single-mode optical fibers (unclad, side-polished, tapered, and U-shaped), long period fiber gratings (LPFG), tilted fiber Bragg gratings (TFBG), and specialty fibers (plastic or polymer, microstructured, and photonic crystal fibers). Configurations involving the excitation of surface plasmon polaritons (SPP) on continuous thin metal layers as well as those involving localized SPR (LSPR) phenomena in nanoparticle metal coatings of gold, silver, and other metals at visible and near-infrared wavelengths are described and compared quantitatively.

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Section: Geometry-modified Fibersmentioning

confidence: 99%

Review of plasmonic fiber optic biochemical sensors: improving the limit of detection

2015

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“…The use of surface plasmon resonance (SPR) effects enhances the sensitivity of fiber-optic sensors for surrounding refractive index (SRI) sensing, and by extension for chemical or biochemical sensing [1,2]. Amongst the wide variety of fiber-optic SPR sensors developed so far, most use metal coatings on geometry-modified fibers, similar in working principle to the prism-based Kretschmann-Raether configuration [3][4][5][6][7][8][9]. Although such fiber-optic SPR sensors can achieve extremely high SRI sensitivities and have been shown in recent experiments to achieve impressive detection results [10,11], the general use of working wavelengths the visible region, figures of merits (FOM) lower than 100 (due to the relatively broad spectral width of the resonance), and, in most cases, the lack of polarization control capability have limited their applications to relatively few laboratory demonstrations.…”

Section: Introductionmentioning

confidence: 99%

High resolution fiber optic surface plasmon resonance sensors with single-sided gold coatings

et al. 2016

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The surface plasmon resonance (SPR) performance of gold coated tilted fiber Bragg gratings (TFBG) at near infrared wavelengths is evaluated as a function of the angle between the tilt plane orientation and the direction of single- and double-sided, nominally 50 nm-thick gold metal depositions. Scanning electron microscope images show that the coating are highly non-uniform around the fiber circumference, varying between near zero and 50 nm. In spite of these variations, the experimental results show that the spectral signature of the TFBG-SPR sensors is similar to that of simulations based on perfectly uniform coatings, provided that the depositions are suitably oriented along the tilt plane direction. Furthermore, it is shown that even a (properly oriented) single-sided coating (over only half of the fiber circumference) is sufficient to provide a theoretically perfect SPR response with a bandwidth under 5 nm, and 90% attenuation. Finally, using a pair of adjacent TFBG resonances within the SPR response envelope, a power detection scheme is used to demonstrate a limit of detection of 3 × 10^-6 refractive index units.

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“…With surrounding RI increasing, the SPR resonant dip shifts to longer wavelengths and the extinction ratio decreases gradually. The sensitivity is calculated to be ~5014 nm/RIU at 1.3000-RI, and enhances apparently with surrounding RI increasing and that at 1.3350 reaches to ~22779 nm/RIU, which is one order of magnitude higher than that of conventional SPR sensors based on silica fibers [20,21]. The relationship between the resonant wavelengths and surrounding RIs are plotted in Fig.…”

Section: Principle and Fabricationmentioning

confidence: 96%

Highly sensitive surface plasmon resonance biosensor based on a low-index polymer optical fiber

et al. 2018

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A highly sensitive refractive index sensor based on surface plasmon resonance in a side-polished low-index polymer optical fiber is proposed for biosensing. Benefitting from the low refractive index of the fiber core, the sensitivity of the device can reach ~44567 nm/RIU theoretically for aqueous solutions, at the expense of a lowered upper detection limit that is down to ~1.340. The sensor is fabricated by coating 55-nm-thick Au-film on the polished surface of a graded-index perfluorinated polymer optical fiber. Results show that the sensor exhibits a sensitivity of ~22779 nm/RIU at 1.335 with a figure of merit of 61.2. When employed for glucose sensing, the sensor presents an averaged sensitivity of 24.50 nm/wt%, or 0.46 nm/mM. This device is expected to have potential applications in cost-effective bio- and chemical-sensing.

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Optical Fiber Micro-Taper with Circular Symmetric Gold Coating for Sensor Applications Based on Surface Plasmon Resonance

Cited by 31 publications

References 33 publications

Review of plasmonic fiber optic biochemical sensors: improving the limit of detection

Review of plasmonic fiber optic biochemical sensors: improving the limit of detection

High resolution fiber optic surface plasmon resonance sensors with single-sided gold coatings

Highly sensitive surface plasmon resonance biosensor based on a low-index polymer optical fiber

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