Tapered-fiber-based refractive index sensor at an air/solution interface

Lu, Ping; Harris, Jérémie; Wang, Xiaozhen; Lin, Ganbin; Chen, Liang; Bao, Xiaoyi

doi:10.1364/ao.51.007368

Cited by 30 publications

(7 citation statements)

References 28 publications

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“…However, when an optical fiber is tapered, the core/cladding interface is redefined in such a way that causes a portion of the fundamental core mode to be converted to higher-order cladding modes [17]. The schematic diagram of the tapered fiber is as illustrated in Fig.…”

Section: Sensing Principlementioning

confidence: 99%

Sensitive and Specific Protein Sensing Using Single-Mode Tapered Fiber Immobilized With Biorecognition Molecules

et al. 2015

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We examine and demonstrate a biosensor using single-mode tapered fiber that has been immobilized with biorecognition molecules to sense targeted proteins. Interaction of evanescent waves with the external medium surrounding the tapered region produces an interferometric-patterned spectrum, which shifts correspondingly to any changes of refractive index (RI) in the external medium. The proposed setup managed to obtain an RI sensitivity and concentration sensitivity of 2526.8 nm/RIU and 20.368 nm=M, respectively, which, to our knowledge, is highly sensitive when compared with previous studies. The dynamic performance, good specificity, and high sensitivity of the proposed method highlight an immensely beneficial choice for immunological diagnostics.

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Section: Sensing Principlementioning

confidence: 99%

Sensitive and Specific Protein Sensing Using Single-Mode Tapered Fiber Immobilized With Biorecognition Molecules

et al. 2015

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“…Ji et al [16] reported an ultrahigh sensitivity refractive index sensor based on optical microfiber, which achieved a maximum sensitivity of 18681.82 nm∕RIU. Lu et al [17] designed a tapered-fiber-based refractive index sensor at an air/solution interface, and experimentally demonstrated it as an evanescent wave refractive index sensor to measure concentrations of glycerol solutions by monitoring average power attenuation of the tapered fiber. However, both methods are based on silica fiber, the tapering process is complex and difficult to control accurately, and the sensors are fragile compared with the POF scheme.…”

Section: Introductionmentioning

confidence: 99%

Refractive index sensor based on plastic optical fiber with tapered structure

et al. 2014

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This work reports a refractive index sensor made of plastic optical fiber (POF) with tapered structure. Transmission loss is measured when the external environment's refractive index changes from 1.33 to 1.41. Three wavelengths (532, 633, and 780 nm) are used to evaluate the sensitivity of the sensor, and results indicate that 633 nm is the best sensing wavelength due to the increased levels of sensitivity achieved at this wavelength. A biconical sensing structure is designed to enhance the sensitivity of the sensor. A sensitivity of 950 μW/RIU at 633 nm is obtained for a biconical sensing structure when launched power is 1 mW. Due to its sensitivity to the refractive index and simple construction, POF with tapered structure has potential applications in the biosensing field.

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“…In recent years, evanescent wave (EW) fiber-optic absorption sensors have received considerable attention due to their widespread applications in biochemical testing, environmental and food safety testing, and many other fields [1][2][3][4][5][6][7][8]. The sensors have the advantages of being fast, real-time, in situ, remote, and safe for application to micro biochemical systems and food safety.…”

Section: Introductionmentioning

confidence: 99%

Fiber-optic evanescent wave sensor with a segmented structure

Liu

et al. 2014

Appl. Opt.

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A segmented structure optic fiber sensor is proposed and demonstrated; it is based on evanescent wave absorption theory. The waveguide modes of the segmented structure are simulated and analyzed by using the beam propagation method, which shows the high-order modes are excited repeatedly at the first transition of each segmented region. The effect of the number of segments and the core diameters on the sensitivity of the sensors is investigated experimentally. The sensitivity of the sensors is tested by using different concentrations of methylene blue solution. The experimental results show that our sensor's sensitivity is ∼0.0476 L/g, which is two times higher than that of the conventional single straight sensor, with the same core diameters and length of the sensing region, and the absorbance is linearly proportional to the number of segments, while being inversely proportional to the residue core diameter of the etched segments within the concentration range from 2 to 14 g/L. These results are consistent with theoretical models and simulation analysis. The proposed sensor not only has high sensitivity, but it is also robust due to the large core diameter of the segmented region, which is suitable for materials spectrum measurements.

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Tapered-fiber-based refractive index sensor at an air/solution interface

Cited by 30 publications

References 28 publications

Sensitive and Specific Protein Sensing Using Single-Mode Tapered Fiber Immobilized With Biorecognition Molecules

Sensitive and Specific Protein Sensing Using Single-Mode Tapered Fiber Immobilized With Biorecognition Molecules

Refractive index sensor based on plastic optical fiber with tapered structure

Fiber-optic evanescent wave sensor with a segmented structure

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