Stack of Nano-Films on Optical Fiber End Face for Label-Free Bio-Recognition

Różycki-Bakon, Radosław; Koba, Marcin; Firek, Piotr; Roźniecka, Ewa; Niedziółka‐Jönsson, Joanna; Śmietana, Mateusz

doi:10.1109/jlt.2016.2615294

Cited by 19 publications

(9 citation statements)

References 17 publications

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“…Numerical analysis performed in this work are based on the transfer matrix method algorithm. The method was implemented in accordance with the mathematical derivation shown in [17]. It assumes that reflection is calculated on the fiber-multilayer interface and the layered nanostructure at the fiber end-face is excited with a plane wave.…”

Section: A Numerical Analysismentioning

confidence: 99%

“…Moreover, the reflectivity at the planes formed only by the single-layer is rather low [14]. Thus, in other works devoted to thin-layer-based FPI sensors the authors applied multiple thin layers, where one thin layer forms the cavity and the others form a sort of reflectors [15]- [17]. In such configurations, on top of changes in power also the wavelength shifts in the spectrum with next may be observed.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring Refractive Index and Adlayer Sensitivity of an Optical Fiber Fabry-Perot Interferometer by a Thin Layer Deposition

Burnat¹,

Kwietniewski²,

Bartnik³

et al. 2022

Preprint

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This work discusses the capability of tailoring sensitivity of an optical-fiber-based Fabry–Perot interferometric (FPI) sensor to changes in refractive index (volume) and formation of a layer on the sensor surface (adlayer). A simple single-layer approach shows some disadvantages, especially when refractive index (n) sensing is considered, e.g., there is no shift of the interference pattern in the wavelength domain. The considered FPI sensor is based on two transparent thin films deposited on a single-mode optical fiber’s end face. As the first layer, a high-n titanium oxide (TiO2) was chosen. We show that addition of a second layer of lower n results in the blueshift of spectral pattern with external n (next). Moreover, when an additional layer, e.g., biological one, is formed, a redshift of the pattern appears, what is in contrary to the shift induced by the increase of next. Numerical analysis as well as experiments show that a wide range of materials (with different n and thickness) can be applied as the second layer, influencing both volume and adlayer sensitivities. We have found that when the second layer thickness is tailored to obtain a well spectrally defined pattern, high n contrast between the layers increases the volume sensitivity, while for the moderate n contrast the adlayer sensitivity of the FPI can be enhanced. The proposed approach shows large tuning capability towards desired application, as well as can be easily introduced to large-scale sensor manufacturing.

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Section: A Numerical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tailoring Refractive Index and Adlayer Sensitivity of an Optical Fiber Fabry-Perot Interferometer by a Thin Layer Deposition

Burnat¹,

Kwietniewski²,

Bartnik³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

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“…Nowadays, advanced fabrication techniques allow the incorporation of various nanomaterials for the tuning of sensing devices, including fiber-optic sensors [ 1 , 2 , 3 , 4 ]. Fiber-optic sensing devices can find application in many different fields of science such as chemistry (composition and content of various solutions) [ 1 , 2 , 5 , 6 ], biology [ 7 , 8 , 9 , 10 ] and physics [ 11 , 12 , 13 , 14 ]. Fiber-optics based sensors present a number of advantages, including high sensitivity, the ability to be used in demanding environments (narrow spaces, hazardous areas), as well as immunity to electromagnetic noise during operation [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Microsphere ZnO ALD Coating Dedicated for the Fiber-Optic Refractive Index Sensor

et al. 2019

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We report the fabrication of a novel fiber-optic sensor device, based on the use of a microsphere conformally coated with a thin layer of zinc oxide (ZnO) by atomic layer deposition (ALD), and its use as a refractive index sensor. The microsphere was prepared on the tip of a single-mode optical fiber, on which a conformal ZnO thin film of 200 nm was deposited using an ALD process based on diethyl zinc (DEZ) and water at 100 °C. The modified fiber-optic microsphere was examined using scanning electron microscopy and Raman spectroscopy. Theoretical modeling has been carried out to assess the structure performance, and the performed experimental measurements carried out confirmed the enhanced sensing abilities when the microsphere was coated with a ZnO layer. The fabricated refractive index sensor was operating in a reflective mode of a Fabry–Pérot configuration, using a low coherent measurement system. The application of the ALD ZnO coating enabled for a better measurement of the refractive index of samples in the range of the refractive index allowed by the optical fiber. The proof-of-concept results presented in this work open prospects for the sensing community and will promote the use of fiber-optic sensing technologies.

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“…In contrast to the widely-used prism-based refractometers, the RI sensors based on optical fibers offer many advantages, such as immunity to electromagnetic interference, high sensitivity, and low cost, and when biological sensing is considered -easy sample disposal. Various optical fiber RI sensors have been reported based on fiber Bragg gating (FBG) [1], [2], long-period grating (LPG) [3], [4], tapered fiber [5]- [8], and Fabry-Perot interferometer (FPI) [9], [10]. Among them, fiber-based Mach-Zehnder (MZI) [11]- [14] and Michelson [15], [16] interferometers are extensively studied for RI sensing.…”

Section: Introductionmentioning

confidence: 99%

Dual Mach–Zehnder Interferometer Based on Side-Hole Fiber for High-Sensitivity Refractive Index Sensing

Śmietana

Wang

et al. 2019

IEEE Photonics J.

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A unique type of refractive index (RI) sensor is proposed using a dual Mach-Zehnder interferometer (MZI) structure based on side-hole fibers (SHFs). The MZI structure contains two single-mode fibers (SMFs), two coreless fiber (CLF) sections and an SHF section, which are spliced together in the order of SMF-CLF-SHF-CLF-SMF. The SMFs and the CLFs enable light lead in/out and beam splitting/combining, respectively. As a special feature of the structure, one hole of SHF is exposed for liquid filling and to form two MZIs as well. Three types of sensors are fabricated, namely S1, S2 and S3. Numerical simulation and experimental studies have been conducted to characterize the sensing performance. The RI sensitivity of the S1 using the ∼550 μm long SHF section reaches 14,000 nm/RIU. When a shorter SHF section is used in S2, the detectable RI range is broadened due to larger FSR. When the closed hole of SHF in S3 is filled with liquid to introduce the Vernier effect, the sensitivity can be further enhanced to over 44,000 nm/RIU (i.e., Refractive Index Unit), which corresponds to the detection limit at the level of 1.0 × 10 −5 RIU. This sensor design is original and easy to package, which gives it potential for label-free biochemical analyses.

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Stack of Nano-Films on Optical Fiber End Face for Label-Free Bio-Recognition

Cited by 19 publications

References 17 publications

Tailoring Refractive Index and Adlayer Sensitivity of an Optical Fiber Fabry-Perot Interferometer by a Thin Layer Deposition

Tailoring Refractive Index and Adlayer Sensitivity of an Optical Fiber Fabry-Perot Interferometer by a Thin Layer Deposition

Preparation and Characterization of Microsphere ZnO ALD Coating Dedicated for the Fiber-Optic Refractive Index Sensor

Dual Mach–Zehnder Interferometer Based on Side-Hole Fiber for High-Sensitivity Refractive Index Sensing

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