A seven-core fibre for fluorescence spectroscopy

Ahmed Samir, Bostjan Batagelj


Fibre-optic fluorescent probes need special filtering; this allows them to reject the strong excitation light while transmitting the weak fluorescent light to the detector. In this paper, a seven-core fibre with optically coupled cores is proposed for fluorescent probes. Using core-to-core mode coupling for filtration instead of mounting conventional filters would decrease the number of necessary parts and the size of the probe, making it suitable for spectroscopic applications. The proposed probe was assembled with the central core being used to transmit and couple the excitation radiation to the outer six cores. Using all the cores for delivering the excitation light from the source to the sample reduces the risk of sample being photochemically damaged compared to excitation by a single-core fibre. Fluorescence emission feedback radiation at a higher wavelength can be collected in the outer six cores, and then the fluorescence signal can be coupled from these cores to the central core. The results from the numerical simulations of the 3D full-vectorial model show two cases corresponding to peak transmission at wavelengths of 410 nm and 480 nm. Therefore, the selectivity of the wavelength ensures that the light directed into the central core will pass through it and reach the end of the probe, except for certain wavelengths, where it will couple and appear at the end of the other cores.


multi-core fibre; fluorescent probe; wavelength filtering devices; spectral filtering

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K. V. Grattan, T. Sun, “Fiber optic sensor technology: an overview”, Sensor and Actuators A: Physical,vol. 82, pp. 40-61,2000.

S. Begus, G. Beges, J. Dronvsek, D. Hudoklin, “A novel NIR laser-based sensor for measuring the surface moisture in polymers”, Sensors and Actuators A: physical, vol. 221, pp. 53-59, 2015.

W. R. Seitz, “Chemical sensors based on fiber optics”, Anal. Chem., vol. 56, pp. 16A-34A, 1984.

M. L. Myrik, S. M. Angel and R. Desidero, “Comparison of some fiber optic configurations for measurements of fluorescence and Raman scattering”, Appl. Optics, vol. 29, no. 9, pp. 1333-1343, 1990.

A. H. Uddin, P. A. E. Piunno, R. H. E Hudson, M. J. Damha and U. J. Krull, “A fiber optic biosensor for fluorimetric detection of triple-helical DNA”, Nucleic Acids Research, vol. 25, no. 20, pp. 4139–4146, 1997.

M. C. Yappert, S. Lai, and D. Borchmanj, “ Age Dependence and Distribution of Green and Blue Fluorophores in Human Lens Homogenates”, Invest. Opthalmol. Vis. Sci, vol. 33, , no. 13, pp. 3555-3560, 1992.

L. A. Saari, W. R. Seitz, “pH Sensor Based on Immobilized Fluoresceinamine”, Anal. Chem., vol. 54, pp. 821-823, 1982.

G.F. Kirkbright, R. Narrayanaswamy, N. Welti, “Fibre-optic pH probe based on the use of an immobilised colorimetric indicator”, Analyst, vol. 109, pp. 1025-1028, 1984.

G.K. Bhowmic, N. Gautam, L.M. Gantayet, “Design optimization of fiber optic probes for remote fluorescence spectroscopy”, Optics Communications. 282:2676-2684, 2009.

A. Samir, B. Batagelj, “A multicore fibre probe for fluorescence spectroscopy”, Proceedings, 52nd International Conference on Microelectronics, Devices and Materials, September, Ankaran, Slovenia, MIDEM - Society for Microelectronics, Electronic Components and Materials 2016.

J.R. Guzmán-Sepúlveda, R. Guzmán-Cabrera, M. Torres-Cisneros, J.J. Sánchez-Mondragón, D.A. May-Arrioja, “A highly sensitive fiber optic sensor based on two-core fiber for refractive index measurement”, Sensors vol. 13, 14200–14213, 2013.

X. Liu, S. Chandrasekhar, X. Chen, P.J. Winzer, Y. Pan, T.F. Taunay, B. Zhu, M. Fishteyn, M.F. Yan, J.M. Fini, E.M. Monberg, and F.V.Dimarcello ,“1.12−Tb/s 32−QAM−OFDM superchannel with 8.6–b/s/Hz intrachannel spectral efficiency and space−division multiplexed transmission with 60−b/s/Hz aggregate spectral efficiency”, Opt. Express, vol. 19, pp. B958–B964, 2011.

I. Gasulla and J. Capmany, “Microwave photonics applications of multicore fibers”, IEEE Photonics J., vol. 4, pp. 877–888, 2012.

B.M. Shalaby, V. Kermene, D. Pagnoux, A. Desfarges-Berthelemot, and A. Barthélémy, “Phase−locked supermode emissions from a dual multicore fibre laser”, Appl. Phys. B, vol. 105, pp. 213–217, 2011.

Y. Huo, P. K. Cheo, and G. King, “Fundamental mode operation of a 19-core phase-locked Yb-doped fiber amplifier”, Opt. Express, vol. 12, , pp. 6230–6239, 2004.

X. Li, B. Sun and Y. Yu, “Ultra-wide bandwidth wavelength selective couplers based on the all solid multi-core Ge-doped fibre”, Opto−Electronics Review, vol. 22, pp. 166–170, 2014.

M. Kovačič, J. Krč, B. Lipovšek and M. Topič, Modelling of diffraction grating based optical filters for fluorescence detection of biomolecules, Biomedical Optics Express, vol. 5, pp. 2285-2300, 2014.

P. R. Stoddart and D. J. White, “Optical fibre SERS sensors”, Anal. Bioanal. Chem., vol. 394, pp. 1761–1774, 2009.

S. Dochow, I. Latka, M. Becker, R. Spittel, J. Kobelke, K. Schuster, A. Graf, S. Brückner, S. Unger, M. Rothhardt, B. Dietzek, C. Krafft, and J. Popp, “Multicore fiber with integrated fiber Bragg grating for background-free Raman sensing”, Opt. Express, vol. 20, pp. 20156-20169, 2012.

A. S. Sudbo, ”Film mode matching: a versatile numerical method for vector mode field calculations in dielectric waveguides. Pure”, Appl. Opt. vol. 2, pp. 211-233, 1993.

S.T. Peng, and A. A. Oliner, “Guidance and leakage properties of a class of open dielectric waveguides: Part I mathematical formulations”, IEEE-MTT vol. 29, pp. 843-855, 1981.

D.F.G. Gallagher, T.P. Felici, “Eigenmode Expansion Methods for Simulation of Optical Propagation in Photonics - Pros and Cons”, Proceedings of SPIE, Vol 4987, pp. 69-82, 2003.

J. Hudgings, L. Molter, and M. Dutta, “Design and modeling of passive optical switches and power dividers using non-planar coupled fiber arrays,” IEEE J. Quantum Electron. 36(12), 1438–1444 (2000).

Y. C. Meng, Q. Z. Guo, W. H. Tan, and Z. M. Huang, “Analytical solutions of coupled-mode equations for multiwaveguide systems, obtained by use of Chebyshev and generalized Chebyshev polynomials,” J. Opt. Soc. Am. A 21(8), 1518–1528 (2004).

N. Kishi and E. Yamashita, “A simple coupled-mode analysis method for multiple-core optical fiber and coupled dielectric waveguide structures,” IEEE Trans. Microwave Theory Tech. 36(12), 1861–1868 (1988).

J. Zhou, “Analytical formulation of super-modes inside multi-core fibers with circularly distributed cores”, OPTICS EXPRESS, Vol 22, pp. 673-688, 2014.

C. Jollivet, A. Mafi, D. Flamm, M. Duparré, K. Schuster, S. Grimm, and A.Schülzgen, “Mode-resolved gain analysis and lasing in multi-supermode multi-core fiber laser”, OPTICS EXPRESS, Vol 22, pp. 30377-30386, 2014.


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