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Simulation of a Sensitive Mid-infrared (MIR) D-Shaped Optical Fiber Water Pollutant Sensor (2023)
Journal Article
Younis, B. M., Dawood, N. Y. M., Abd-Elkader, A. E., Furniss, D., Farries, M., Phang, S., …Obayya, S. S. A. (2023). Simulation of a Sensitive Mid-infrared (MIR) D-Shaped Optical Fiber Water Pollutant Sensor. Plasmonics, https://doi.org/10.1007/s11468-023-02110-6

In this work, an efficient optical sensor is proposed for the sensitive detection of various pollutants in water. The suggested optical sensor is based on an indium fluoride (InF3) glass fabricated as a D-shaped optical fiber. The polished surface of... Read More about Simulation of a Sensitive Mid-infrared (MIR) D-Shaped Optical Fiber Water Pollutant Sensor.

Optical strain sensor with dual fibre Bragg grating topology (2023)
Journal Article
Palmowski, J., Barczak, K., Kubicka, N., Gołek, F., Benson, L., Maciak, E., …Bereś-Pawlik, E. (2023). Optical strain sensor with dual fibre Bragg grating topology. Optical and Quantum Electronics, 55(5), Article 453. https://doi.org/10.1007/s11082-023-04746-4

The paper presents the design, operation, and proof of principle realisation and validation of a relatively cheap fibre optic strain sensor based on two fibre Bragg grating (FBG) elements with different spectral responses. Its performance is compared... Read More about Optical strain sensor with dual fibre Bragg grating topology.

Impact of In-Situ Radome Lightning Diverter Strips on Antenna Performance (2020)
Journal Article
Vukovic, A., Sewell, P., & Benson, T. M. (2020). Impact of In-Situ Radome Lightning Diverter Strips on Antenna Performance. IEEE Transactions on Antennas and Propagation, 68(11), 7287-7296. https://doi.org/10.1109/tap.2020.2998169

Lightning diverter strips are commonly used to protect the antenna and sensitive equipment within an airborne radome. This paper compares the impact of solid metallic and segmented diverter strips on the radiation properties of the enclosed antenna.... Read More about Impact of In-Situ Radome Lightning Diverter Strips on Antenna Performance.

Stretched-coordinate PML in 2D TLM simulations (2020)
Journal Article
Odeyemi, J. S., Vukovic, A., Benson, T. M., & Sewell, P. (2020). Stretched-coordinate PML in 2D TLM simulations. IET Science Measurement and Technology, 14(3), 272-277. https://doi.org/10.1049/iet-smt.2019.0340

A novel implementation of the stretched coordinate perfectly matched layer (PML) is presented for the two-dimensional (2D) transmission line modelling (TLM) method. The formulation offers a unified approach and is based on the mapping of the TLM node... Read More about Stretched-coordinate PML in 2D TLM simulations.

Experimental photoluminescence and lifetimes at wavelengths including beyond 7 microns in Sm3+-doped selenide-chalcogenide glass fibers (2020)
Journal Article
Crane, R. W., Sojka, Ł., Furniss, D., Nunes, J., Barney, E., Farries, M. C., …Seddon, A. B. (2020). Experimental photoluminescence and lifetimes at wavelengths including beyond 7 microns in Sm3+-doped selenide-chalcogenide glass fibers. Optics Express, 28(8), 12373-12384. https://doi.org/10.1364/oe.383033

1000 ppmw Sm3+-doped Ge19.4Sb9.7Se67.9Ga3 atomic % chalcogenide bulk glass and unstructured fiber are prepared. Near- and mid-infrared absorption spectra of the bulk glass reveal Sm3+ electronic absorption bands, and extrinsic vibrational absorption... Read More about Experimental photoluminescence and lifetimes at wavelengths including beyond 7 microns in Sm3+-doped selenide-chalcogenide glass fibers.

Mid-infrared sources for biomedical applications based on chalcogenide glass fibres (2020)
Journal Article
Seddon, A. B., Sujecki, S., Sojka, L., Furniss, D., Tang, Z., Mabwa, D., …Benson, T. M. (2020). Mid-infrared sources for biomedical applications based on chalcogenide glass fibres. Proceedings of SPIE, 11357, Article 1135710. https://doi.org/10.1117/12.2568040

Many important molecules show strong characteristic vibrational transitions in the mid-infrared (MIR) part of the electromagnetic spectrum. This leads to applications in spectroscopy, chemical and bio-molecular sensing, security and industry, especia... Read More about Mid-infrared sources for biomedical applications based on chalcogenide glass fibres.

A Complex Domain Mapping of the SCN for an Effective PML Implementation in TLM (2020)
Journal Article
Odeyemi, J. S., Vukovic, A., Benson, T. M., & Sewell, P. D. (2020). A Complex Domain Mapping of the SCN for an Effective PML Implementation in TLM. IEEE Open Journal of Antennas and Propagation, 1, 2637-6431. https://doi.org/10.1109/ojap.2020.2986293

An improved implementation of the perfectly matched layer (PML) is developed for the Transmission Line Modelling (TLM) method based on a mapping of the symmetrical condensed node (SCN) to an analytically extended geometric space. By mapping the TLM n... Read More about A Complex Domain Mapping of the SCN for an Effective PML Implementation in TLM.

High purity Ge-Sb-Se/S step index optical fibers (2019)
Journal Article
Parnell, H., Furniss, D., Tang, Z., Fang, Y., Benson, T., Canedy, C., …Seddon, A. (2019). High purity Ge-Sb-Se/S step index optical fibers. Optical Materials Express, 9(9), 3616-3626. https://doi.org/10.1364/OME.9.003616

Chalcogenide glasses are a promising group of materials for remote sensing applications. Two compositions from the Ge-Sb-Se/S system are investigated as core and cladding glasses in a step index fiber (SIF). Following thermomechanical and refractive... Read More about High purity Ge-Sb-Se/S step index optical fibers.

Experimental observation of gain in a resonantly pumped Pr3+-doped chalcogenide glass mid-infrared fibre amplifier notwithstanding the signal excited-state absorption (2019)
Journal Article
Shen, M., Furniss, D., Farries, M., Jayasuriya, D., Tang, Z., Sojka, L., …Seddon, A. B. (2019). Experimental observation of gain in a resonantly pumped Pr3+-doped chalcogenide glass mid-infrared fibre amplifier notwithstanding the signal excited-state absorption. Scientific Reports, 9, Article 11426. https://doi.org/10.1038/s41598-019-47432-w

We demonstrate a maximum gain of 4.6 dB at a signal wavelength of 5.28 μm in a 4.1 μm resonantly pumped Pr3+- doped selenide-based chalcogenide glass fibre amplifier of length 109 mm, as well as a new signal excited-stated absorption (ESA) at signal... Read More about Experimental observation of gain in a resonantly pumped Pr3+-doped chalcogenide glass mid-infrared fibre amplifier notwithstanding the signal excited-state absorption.

(INVITED) Methods for determining the refractive indices and thermo-optic coefficients of chalcogenide glasses at MIR wavelengths (2019)
Journal Article
Fang, Y., Furniss, D., Jayasuriya, D., Parnell, H., Tang, Z., Gibson, D., …Benson, T. (2019). (INVITED) Methods for determining the refractive indices and thermo-optic coefficients of chalcogenide glasses at MIR wavelengths. Optical Materials: X, 2, Article 100030. https://doi.org/10.1016/j.omx.2019.100030

Chalcogenide glasses have attracted much attention for the realization of photonic components owing to their outstanding optical properties in the mid-infrared (MIR) region. However, relatively few refractive index dispersion data are presently avail... Read More about (INVITED) Methods for determining the refractive indices and thermo-optic coefficients of chalcogenide glasses at MIR wavelengths.

Mid-IR supercontinuum generation in birefringent, low loss, ultra-high numerical aperture Ge-As-Se-Te chalcogenide step-index fiber (2019)
Journal Article
Jayasuriya, D., Petersen, C. R., Furniss, D., Markos, C., Tang, Z., Habib, M. S., …Seddon, A. B. (2019). Mid-IR supercontinuum generation in birefringent, low loss, ultra-high numerical aperture Ge-As-Se-Te chalcogenide step-index fiber. Optical Materials Express, 9(6), 2617-2629. https://doi.org/10.1364/ome.9.002617

This work reports on the fabrication and subsequent supercontinuum generation in a Ge-As-Se-Te/Ge-As-Se core/clad chalcogenide step-index fiber with an elliptical-core and an ultra-high numerical aperture of 1.88 ± 0.02 from 2.5 - 15 µm wavelength. T... Read More about Mid-IR supercontinuum generation in birefringent, low loss, ultra-high numerical aperture Ge-As-Se-Te chalcogenide step-index fiber.

Modeling propagation in large deformed step-index fibers using a finite operator method (2019)
Journal Article
Kumar, D. S., Creagh, S. C., Sujecki, S., & Benson, T. M. (2019). Modeling propagation in large deformed step-index fibers using a finite operator method. Journal of the Optical Society of America B, 36(5), 1208-1221. https://doi.org/10.1364/josab.36.001208

© 2019 Optical Society of America. A finite operator model is applied to the propagation of light in deformed step-index fibers. The distribution of the light captured by the fiber from an arbitrary initial excitation is illustrated in the phase spac... Read More about Modeling propagation in large deformed step-index fibers using a finite operator method.

Determining small refractive index contrast in chalcogenide-glass pairs at mid-infrared wavelengths (2019)
Journal Article
Fang, Y., Furniss, D., Jayasuriya, D., Parnell, H., Crane, R., Tang, Z., …Benson, T. (2019). Determining small refractive index contrast in chalcogenide-glass pairs at mid-infrared wavelengths. Optical Materials Express, 9(5), 2022-2036. https://doi.org/10.1364/OME.9.002022

A two-composition thin film (Ge20Sb10Se70/Ge20Sb10Se67S3 atomic%core/cladding glasses) was fabricated using a hot-fibre-pressing technique in which both glasses follow the same post-fibre processing. A simple approach is proposed that uses normal inc... Read More about Determining small refractive index contrast in chalcogenide-glass pairs at mid-infrared wavelengths.

Experimental and numerical investigation to rationalize both near-infrared and mid-infrared spontaneous emission in Pr3+ doped selenide-chalcogenide fiber (2019)
Journal Article
Sujecki, S., Sojka, L., Beres-Pawlik, E., Anders, K., Piramidowicz, R., Tang, Z., …Seddon, A. (2019). Experimental and numerical investigation to rationalize both near-infrared and mid-infrared spontaneous emission in Pr3+ doped selenide-chalcogenide fiber. Journal of Luminescence, 209, 14-20. https://doi.org/10.1016/j.jlumin.2019.01.023

This contribution reports on detailed experimental and numerical investigations of both near-infrared (NIR) and mid-infrared (MIR) photoluminescence obtained in praseodymium trivalent ion doped chalcogenide-selenide glass fiber. The experimental anal... Read More about Experimental and numerical investigation to rationalize both near-infrared and mid-infrared spontaneous emission in Pr3+ doped selenide-chalcogenide fiber.

Modeling of resonantly pumped mid-infrared Pr3+-doped chalcogenide fiber amplifier with different pumping schemes (2018)
Journal Article
Shen, M., Furniss, D., Tang, Z., Barney, E. R., Sójka, L., Sujecki, S., …Seddon, A. B. (2018). Modeling of resonantly pumped mid-infrared Pr3+-doped chalcogenide fiber amplifier with different pumping schemes. Optics Express, 26(18), 23641-23660. https://doi.org/10.1364/OE.26.023641

We propose a model for resonantly pumped Pr3+-doped chalcogenide fiber amplifiers which includes excited state absorption and the full spectral amplified spontaneous emission spanning from 2 μm to 6 μm. Based on this model, the observed near- and mid... Read More about Modeling of resonantly pumped mid-infrared Pr3+-doped chalcogenide fiber amplifier with different pumping schemes.

Experimental investigation of mid-infrared laser action from DY3+ doped fluorozirconate fiber (2018)
Journal Article
Sójka, L., Pajewski, L., Popenda, M., Beres-Pawlik, E., Lamrini, S., Markowski, K., …Sujecki, S. (2018). Experimental investigation of mid-infrared laser action from DY3+ doped fluorozirconate fiber. IEEE Photonics Technology Letters, 30(12), 1083-1086. https://doi.org/10.1109/LPT.2018.2832009

Efficient continuous-wave laser operation at 2.982 μm is achieved with a Dy3:fluoride fiber pumped using an inhouse-built 1.1 μm ytterbium (III) fiber laser. The laser output power reached is 554 mW, with a maximum slope efficiency of 18% with respec... Read More about Experimental investigation of mid-infrared laser action from DY3+ doped fluorozirconate fiber.

Numerical analysis of spontaneous mid-infrared light emission from terbium ion doped multimode chalcogenide fibers (2018)
Journal Article
Sujecki, S., Sojka, L., Pawlik, E., Anders, K., Piramidowicz, R., Tang, Z., …Seddon, A. (2018). Numerical analysis of spontaneous mid-infrared light emission from terbium ion doped multimode chalcogenide fibers. Journal of Luminescence, 199, https://doi.org/10.1016/j.jlumin.2018.03.031

In this contribution we use a numerical model to study the photoluminescence emitted by Tb3+ doped chalcogenide-selenide glass fibers pumped by laser light at approximately 3 µm. The model consists of the set of ordinary differential equations (ODEs)... Read More about Numerical analysis of spontaneous mid-infrared light emission from terbium ion doped multimode chalcogenide fibers.

Numerical modelling of Tb3+ doped selenide-chalcogenide multimode fibre based spontaneous emission sources (2017)
Journal Article
Sujecki, S., Sójka, L., Bereś-Pawlik, E., Sakr, H., Tang, Z., Barney, E. R., …Seddon, A. B. (2017). Numerical modelling of Tb3+ doped selenide-chalcogenide multimode fibre based spontaneous emission sources. Optical and Quantum Electronics, 49(12), Article 416. https://doi.org/10.1007/s11082-017-1255-5

A model is developed of a terbium (III) ion doped selenide chalcogenide glass fibre source that provides spontaneous emission within the mid-infrared (MIR) wavelength range. Three numerical algorithms are used to calculate the solution and compare th... Read More about Numerical modelling of Tb3+ doped selenide-chalcogenide multimode fibre based spontaneous emission sources.

Determining the refractive index dispersion and thickness of hot-pressed chalcogenide thin films from an improved Swanepoel method (2017)
Journal Article
Fang, Y., Jayasuriya, D., Furniss, D., Tang, Z., Sojka, Ł., Markos, C., …Benson, T. (2017). Determining the refractive index dispersion and thickness of hot-pressed chalcogenide thin films from an improved Swanepoel method. Optical and Quantum Electronics, 49, Article 237. https://doi.org/10.1007/s11082-017-1057-9

The well-known method presented by Swanepoel can be used to determine the refractive index dispersion of thin films in the near-infrared region from wavelength values at maxima and minima, only, of the transmission interference fringes. In order to e... Read More about Determining the refractive index dispersion and thickness of hot-pressed chalcogenide thin films from an improved Swanepoel method.

Measurement of non-linear optical coefficients of chalcogenide glasses near the fundamental absorption band edge (2017)
Journal Article
Romanova, E., Kuzyutkina, Y., Shiryaev, V., Abdel-Moneim, N., Furniss, D., Benson, T., …Guizard, S. (2018). Measurement of non-linear optical coefficients of chalcogenide glasses near the fundamental absorption band edge. Journal of Non-Crystalline Solids, 480, https://doi.org/10.1016/j.jnoncrysol.2017.03.031

A time-resolved pump-probe method is used for the evaluation of non-linear optical coefficients of chalcogenide glasses from the As-S-Se and Ge-Se systems near their fundamental absorption band edges. The results are analyzed via comparison with the... Read More about Measurement of non-linear optical coefficients of chalcogenide glasses near the fundamental absorption band edge.