Negative axial strain sensitivity in gold-coated eccentric fiber Bragg gratings

Chah, Karima; Kinet, Damien; Caucheteur, Christophe

doi:10.1038/srep38042

Cited by 29 publications

(8 citation statements)

References 28 publications

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“…The ability to excite cladding modes with straight FBGs in PCFs can be attributed to this non-uniformity. A similar mechanism is indeed responsible for the appearance of cladding mode resonances in the transmission spectra of some point-by-point [14] and eccentric gratings [50], [51] in step-index fibers, in which refractive index modifications are formed only in a limited region of the core. Note that our attempts to inscribe tilted FBGs in PCFs resulted in significantly weaker cladding resonances than the straight FBGs in the same PCFs.…”

Section: A Fbg Transmission Spectra In Pcfsmentioning

confidence: 82%

Plasmon-Enhanced Refractometry Through Cladding Mode Excitation by a Fiber Bragg Grating in Photonic Crystal Fiber

Rusyakina

Baghdasaryan

Chah

et al. 2022

J. Lightwave Technol.

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We report on an extrinsic surface plasmon-enhanced refractometer based on cladding mode resonance excitation in a photonic crystal fiber (PCF) equipped with a straight fiber Bragg grating (FBG). First, we show that the lattice pitch and the air hole diameter of the PCF microstructure define the spectral location of the excited cladding mode resonances. Second, we demonstrate that if the PCF parameters are properly selected, those resonances are sensitive to increases in steps of 1 × 10 −4 refractive index units (RIU) of the refractive index value close to that of water. To the best of our knowledge, this is the first time that the sensitivity of PCF cladding mode resonances to refractive index changes in water-based solutions is reported. We achieved experimental values of 40.3 nm/RIU in terms of wavelength sensitivity and −801 dB/RIU in terms of amplitude sensitivity. The performance of our sensor is therefore comparable to that of tilted FBGs in step-index fibers used for water refractometry, which indicates the potential of our PCF sensor for biosensing. In addition, the sensor fabrication does not require any post-processing such as etching or polishing, which allows preserving the integrity of the fiber probe. Finally, the narrow spectrum within which the PCF operates, allows envisaging multi-target detection with a single fiber probe by using cascaded wavelength-multiplexed gratings.

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Section: A Fbg Transmission Spectra In Pcfsmentioning

confidence: 82%

Plasmon-Enhanced Refractometry Through Cladding Mode Excitation by a Fiber Bragg Grating in Photonic Crystal Fiber

Rusyakina

Baghdasaryan

Chah

et al. 2022

J. Lightwave Technol.

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“…A special FBG with a wide range and comb with continuous cladding mode resonances (defined as a cladding mode FBG, CMFBG) can be achieved with this modification. Although transmission achieves a similar result to that of a TFBG [11] or an eccentric point by point (PbP) grating [32,33], it is superior to these two. Exciting cladding modes without a specialized/tilted mask is important because a tilted mask costs significantly more than a uniform mask.…”

Section: Fabrication and Characterizationmentioning

confidence: 93%

Fiber Bragg Grating with Enhanced Cladding Modes Inscribed by Femtosecond Laser and a Phase Mask

Bao

Liu

Feng

et al. 2020

Sensors

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In this paper, we demonstrate a fiber Bragg grating (FBG) with a wide range and a comb with continuous cladding mode resonances inscribed in non-photosensitive single mode fibers using a femtosecond laser and a phase mask. The FBG is inscribed in the core and cladding, exciting a series of cladding modes in transmission. The birefringence induced by this FBG structure offers significant polarization-dependence for cladding modes, thus allowing the vector fiber twist to be perceived. By measuring the peak-to-peak differential intensity of orthogonally polarized cladding mode resonances, the proposed sensor presents totally opposite intensity response in the anticlockwise direction for the torsion angle ranging from −45° to 45°. The cladding mode comb approximately covers wavelengths over the O-, E-, S-, and C-bands in transmission. The cutoff cladding mode of air can be observed in the spectrum. Thus, the sensible refractive index range is estimated to be from 1.00 to 1.44. Temperature responsivity of the grating is also characterized. The proposed device potentially provides new solutions to the various challenges of physical vector and bio-chemical parameters sensing.

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“…Eccentric fiber Bragg gratings (EFBGs) correspond to a point-by-point refractive index modulation highly localized in the core, close to the cladding region [ 49 , 50 , 51 , 52 ], as sketched in Figure 5 . They are usually obtained with a tight focussing of a femtosecond pulses laser and the use of an air-bearing translation stage.…”

Section: Review Of Grating Configurations Used For Spr Excitationmentioning

confidence: 99%

Plasmonic Optical Fiber-Grating Immunosensing: A Review

Guo

González-Vila

Loyez

et al. 2017

Sensors

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112

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Plasmonic immunosensors are usually made of a noble metal (in the form of a film or nanoparticles) on which bioreceptors are grafted to sense analytes based on the antibody/antigen or other affinity mechanism. Optical fiber configurations are a miniaturized counterpart to the bulky Kretschmann prism and allow easy light injection and remote operation. To excite a surface plasmon (SP), the core-guided light is locally outcoupled. Unclad optical fibers were the first configurations reported to this end. Among the different architectures able to bring light in contact with the surrounding medium, a great quantity of research is today being conducted on metal-coated fiber gratings photo-imprinted in the fiber core, as they provide modal features that enable SP generation at any wavelength, especially in the telecommunication window. They are perfectly suited for use with cost-effective high-resolution interrogators, allowing both a high sensitivity and a low limit of detection to be reached in immunosensing. This paper will review recent progress made in this field with different kinds of gratings: uniform, tilted and eccentric short-period gratings as well as long-period fiber gratings. Practical cases will be reported, showing that such sensors can be used in very small volumes of analytes and even possibly applied to in vivo diagnosis.

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Negative axial strain sensitivity in gold-coated eccentric fiber Bragg gratings

Cited by 29 publications

References 28 publications

Plasmon-Enhanced Refractometry Through Cladding Mode Excitation by a Fiber Bragg Grating in Photonic Crystal Fiber

Plasmon-Enhanced Refractometry Through Cladding Mode Excitation by a Fiber Bragg Grating in Photonic Crystal Fiber

Fiber Bragg Grating with Enhanced Cladding Modes Inscribed by Femtosecond Laser and a Phase Mask

Plasmonic Optical Fiber-Grating Immunosensing: A Review

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