Optical Nanofiber Coupler Sensors Operating in the Cut-Off Wavelength Region

Talataisong, Wanvisa; Ismaeel, Rand; Lee, Timothy J.; Beresna, Martynas; Brambilla, Gilberto

doi:10.1109/jsen.2018.2802724

Cited by 18 publications

(6 citation statements)

References 23 publications

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“…Therefore, we envisioned to join two arc‐shaped optical waveguides by micromanipulation. It is expected that, in the resultant organic directional coupler with four termini, the curved junction will facilitate the transfer of light from one waveguide to another, which is analogous to evanescent field coupling and subsequent light transfer between two optical fibers in the tapered region. We selected a representative crystal (crystal‐1) with L ≈206 μm (Figure a).…”

Section: Resultsmentioning

confidence: 99%

Mechanophotonics: Flexible Single‐Crystal Organic Waveguides and Circuits

et al. 2020

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We present the one-dimensional optical-waveguiding crystal dithieno[3,2-a:2',3'-c]phenazine with ah igh aspect ratio,high mechanical flexibility,and selective self-absorbance of the blue part of its fluorescence (FL). While macrocrystals exhibit elasticity,m icrocrystals deposited at ag lass surface behave more like plastic crystals due to significant surface adherence,m aking them suitable for constructing photonic circuits via micromechanical operation with an atomic-forcemicroscopyc antilever tip.T he flexible crystalline waveguides displayoptical-path-dependent FL signals at the output termini in both straight and bent configurations,m aking them appropriate for wavelength-division multiplexing technologies. Ar econfigurable 2 2-directional coupler fabricated via micromanipulation by combining two arc-shaped crystals splits the optical signal via evanescent coupling and delivers the signals at two output terminals with different splitting ratios. The presented mechanical micromanipulation technique could also be effectively extended to other flexible crystals.

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Section: Resultsmentioning

confidence: 99%

Mechanophotonics: Flexible Single‐Crystal Organic Waveguides and Circuits

et al. 2020

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“…We believe that the dispersion factor plays a dominate role in this phenomenon. The abovementioned ultrasensitive characteristics have been proposed previously [12][13][14][15][16][17], where minor refractive index variation could induce evident shift of the dip around the DTP. However, inducing a minor refractive index change is challenging.…”

Section: Refractive Index Sensingmentioning

confidence: 95%

“…Thus, we propose a tapered two-mode fiber (TTMF)-based biosensor structure, which consists of an input SMF, a down-taper region, a TTMF section, an up-taper region, and an output SMF. Note that the number of modes existing in the TTMF is determined by its diameter (Dw) and the external surrounding (next) [17]; thus, the section of TTMF needs to be sophisticatedly designed to develop a desired interferometer. Owing to the cosine function of phase difference between the HE11 and HE21 modes, the evolution of the transmission spectra can be illustrated according to the two-mode interferometric theory as follows:…”

Section: Theoretical Analysismentioning

confidence: 99%

High-Sensitivity Detection of IgG Operating near the Dispersion Turning Point in Tapered Two-Mode Fibers

Sun

Wang

2020

Micromachines

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The conventional methods for monitoring IgG levels suffer from some apparent problems such as long assay time, multistep processing, and high overall cost. An effective and suitable optical platform for label-free biosensing was investigated by the implementation of antibody/antigen immunoassays. The ultrasensitive detection of IgG levels could be achieved by exploiting the dispersion turning point (DTP) existing in the tapered two-mode fibers (TTMFs) because the sensitivity will reach ±∞ on either side of the DTP. Tracking the resonant wavelength shift, it was found that the fabricated TTMF device exhibited limits of detection (LOD) down to concentrations of 10 fg/mL of IgG in PBS solution. Such immunosensors based on DTP have great significance on trace detection of IgG due to simple detection scheme, quick response time, and miniaturization.

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“…), or fabricating interferometers by the combination of them [29]. Among all the schemes, fabricating interferometers working near the dispersion turning point (DTP) has been proven to be a very effective approach to significantly improve sensitivity since the sensitivity at the DTP tends to be infinite [30], and thus numerous FIRSs working near the DTP have been proposed, such as the circular microfiber-based in-line modal interferometers (MMIs) [31], [32], the microfiber couplers (MFCs) [33]- [35], the in-fiber Mach-Zehnder interferometer (MZI) formed by a microfiber-assisted U-shape cavity (MFA-USC) [36], and the optofluidic interferometer [37]. In terms of MMIs and MFCs, the DTP can be potentially achieved within a wide RI range by adjusting the microfiber diameter.…”

Section: Introductionmentioning

confidence: 99%

Dual-Path Mach—Zehnder Interferometers With Unequal Geometrical Path Length for Ultrasensitive Refractive Index Sensing

Liao

Wang

et al. 2021

J. Lightwave Technol.

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High-sensitivity fiber-optic interferometric refractive index sensors (FIRSs) have been of interest to researchers due to their potential to fabricate specific physical, chemical, and biological sensors. Fabricating interferometers working near the dispersion turning point (DTP) is an effective approach to improve the sensitivity of FIRSs. However, the group effective refractive index (RI) difference approaching 0 and the ratio of the variation of the effective RI difference to the external RI change being −1 cannot be simultaneously realized in low RI sensing, which restricts the further improvement of sensing sensitivity. Here, dual-path Mach-Zehnder interferometers (MZIs) with unequal geometrical path length are proposed for ultrasensitive RI sensing. The dual-path MZIs contain fiber path and sample path of different geometrical lengths to form the optical path difference. The dual-path MZIs can not only show a turning point where the sensing sensitivity tends to be infinite, which is similar to the previously reported DTP, but also get the constant value −1 for the RI response factor, leading to the result that the dips within an over-500-nm band width around the turning point can achieve high sensitivity reaching 10 5 nm/RIU level or higher. Ultrahigh sensitivity of −1.26 × 10 6 nm/RIU has been experimentally demonstrated at the RI around 1.35022. The dual-path MZIs proposed here may enlighten new ideas for developing high-sensitivity FIRSs.

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Optical Nanofiber Coupler Sensors Operating in the Cut-Off Wavelength Region

Cited by 18 publications

References 23 publications

Mechanophotonics: Flexible Single‐Crystal Organic Waveguides and Circuits

Mechanophotonics: Flexible Single‐Crystal Organic Waveguides and Circuits

High-Sensitivity Detection of IgG Operating near the Dispersion Turning Point in Tapered Two-Mode Fibers

Dual-Path Mach—Zehnder Interferometers With Unequal Geometrical Path Length for Ultrasensitive Refractive Index Sensing

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