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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
High-contrast, GeTe4 waveguides for mid-infrared biomedical sensing applications
Abstract
The ideal molecular "fingerprint" region for biochemical analysis is dominated by the Mid-IR spectral region from 2µm to 13µm. Realisation of single mode waveguides optimised for evanescent field based sensing is essential to detect analytes of very low concentration using their fingerprint molecular vibrations. Since commonly used silicate glasses do not transmit at wavelengths beyond 3µm and some Mid-IR transmitting glasses such as the fluorides degrade when in contact with water, novel materials are required to cover this range. Germanium telluride is a promising material which has a broad IR transparency in the region of 2µm - 20µm. We demonstrate a "high contrast" (Δn ~ 1), GeTe<sub>4</sub> single mode rib waveguide on ZnSe. GeTe<sub>4</sub> thin films were deposited on ZnSe substrates by RF sputtering at room temperature. Deposition parameters such as sputtering pressure, power, and argon flow rate were varied to optimise the deposition conditions and to study their effect on the resulting films. The deposited films were amorphous as confirmed by XRD and the average roughness of the films was between 4 and 11nm as measured by AFM. The films transmitted over the full spectral range from 2µm - 20µm as measured by FTIR. Photolithography followed by reactive-ion etching was carried out to etch the film to produce a rib waveguide structure with low surface roughness and vertical sidewalls, using an optimised mixture of CHF<sub>3</sub> and O<sub>2</sub>. Further optical characterization of these waveguides including propagation loss and mode profile will be presented.