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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wilkinson, James
University of Southampton
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (34/34 displayed)
- 2022Study of prediction intervals in machine learning assisted mid-infrared spectroscopy for the diagnosis of neonatal respiratory distress syndrome
- 2022Prediction of neonatal respiratory distress biomarker concentration by application of machine learning to mid-infrared spectracitations
- 2021High-bandwidth InGaAs photodetectors heterogeneously integrated on silicon waveguides using optofluidic assemblycitations
- 2021The Effect of Haematocrit on Measurement of the Mid-Infrared Refractive Index of Plasma in Whole Bloodcitations
- 2019Mid-IR thermo-optic on-chip spectrometer on a III-V semiconductor platform
- 2018Tantalum pentoxide waveguides and microresonators for VECSEL based frequency combscitations
- 2018Chalcogenide glass waveguides with paper-based fluidics for mid-infrared absorption spectroscopycitations
- 2017Optical quality ZnSe films and low loss waveguides on Si substrates for mid-infrared applicationscitations
- 2015Wavelength division demultiplexer and integrated III-V semiconductor Lasers on a silicon photonics platform with microbubble manipulation
- 2014High-contrast, GeTe4 waveguides for mid-infrared biomedical sensing applicationscitations
- 2012Structural characteristics and optical properties of plasma assisted reactive magnetron sputtered dielectric thin films for planar waveguiding applicationscitations
- 2012Kinoform microlenses for focusing into microfluidic channelscitations
- 2011Integrated Nd-doped borosilicate glass microsphere lasercitations
- 2011Chalcogenide microsphere fabricated from fibre taper-drawn using resistive heating
- 2011Lead silicate glass microsphere resonators with absorption-limited Qcitations
- 2010Simultaneous poling and planar waveguide fabrication in glasses
- 2010Position-dependent coupling between a channel waveguide and a distorted microsphere resonatorcitations
- 2010Structural and optical properties of yttrium oxide thin films for planar waveguiding applicationscitations
- 2010Chalcogenide glass microsphere lasercitations
- 2009Chalcogenide glass microspheres and their applications
- 2009Optical fiber nanowires and microwires: fabrication and applicationscitations
- 2007Chalcogenide glass microspheres: their production characterization and potentialcitations
- 2006Whispering gallery modes excitation in borosilicate glass microspheres by K+ ion-exchanged channel waveguide couplercitations
- 2006Control of coupling between waveguides and microsphere resonators
- 2005Strong refractive index changes induced in Ag ion exchanged Er doped phosphate glass using 248 nm excimer laser radiation
- 2004Strong refractive index changes induced in Ag+ ion-exchanged Er-doped phosphate glass using 248nm excimer laser radiation
- 2004Long refractive index changes induced in Ag+ ion-exchanged Er-doped phosphate glass using 248nm excimer laser radiation
- 2004Photosensitivity of ion-exchanged Er-doped phosphate glass using 248nm excimer laser radiationcitations
- 2003Sub-micron period grating structures in Ta2O5 thin oxide films patterned using UV laser post-exposure chemically assisted selective etching
- 2003New deep glass etching technology
- 2002Planar waveguides in multicomponent glasses fabricated by field-driven differential drift of cationscitations
- 2001Gratings in indium oxide film overlayers on ion-exchanged waveguides by excimer laser micromachiningcitations
- 2001Dynamic AC surface discharge characteristics of PMMA and LDPEcitations
- 2000Relief gratings on Er/Yb-doped borosilicate glasses and waveguides by excimer laser ablationcitations
Places of action
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document
Strong refractive index changes induced in Ag+ ion-exchanged Er-doped phosphate glass using 248nm excimer laser radiation
Abstract
Er-doped phosphate glasses are excellent host materials for the fabrication of high-gain waveguide and fibre lasers and amplifiers emitting in the 1.55µm telecommunication window. The photosensitivity of those glasses under intense UV radiation may be of great significance, since diffraction gratings and waveguide structures may be inscribed in such glasses, leading to the development of functional photonic devices. The photosensitivity of a commercial phosphate glass (Schott IOG-1), which is doped with Er<sup>3+</sup> ions and has been ion-exchanged with Ag<sup>+</sup> ions, is examined using nanosecond 248nm excimer laser radiation. Grating structures of 510nm period are inscribed in un-treated and ion-exchanged Er-doped IOG-1 glass by employing phase mask interference in contact mode. The dependence of UV-induced refractive index changes upon the Ag<sup>+</sup> concentration during ion-exchange and the exposure conditions were studied using diffraction efficiency measurements. Refractive index changes in untreated glasses are of the order of ~10<sup>-5</sup>, whereas for silver ion-exchanged samples such changes reach values of ~2.0x10<sup>-3</sup>, for UV exposures of 30000 pulses and 400mJ/cm<sup>2</sup> energy density. Measurements of the absorption spectra of exposed and un-exposed samples are carried out in order to reveal specific absorption bands and illustrate photosensitivity mechanisms. Furthermore, energy dispersive x-ray microanalysis (EDX) of the exposed ion-exchanged glass samples, reveal that UV radiation induces significant migration of the Ag+ ions towards the areas of high energy densities. Such observation is also supported by scanning electron microscopy (SEM) scans of the inscribed gratings, where shallow relief structures of few nanometer height are formed in the bright fringes of the interference pattern; pronouncing significant structural changes due to the UV exposure.