Demosthenes Koutsogeorgis

Demosthenes Koutsogeorgis

Associate Professor

School of Science & Technology

Staff Group(s)
Physics and Mathematics

Role

Reader in Photonic Technologies

Dr Koutsogeorgis' responsibilities include teaching, both at undergraduate and postgraduate levels, as well as academic and industrial research.

He is a Module Leader, a Placement Tutor, a Project Supervisor (Final Year and Masters), a Director of Studies for several PhD programmes, a Research Group Leader (Electronic and Photonic Materials Research Group - for research interests and activity please see the relevant tab) and finally the NTU Laser Safety Adviser.

Dr Koutsogeorgis has been one of the founding members (in 2006) of an initiative for providing industry with direct access to the expertise of his Research Group at NTU, via "Thin Film Services" (TFS). This initiative was succeeded by a wider initiative "Scientific Services To Industry" (SS2i), covering the whole School of Science and Technology at NTU. More recently he has been a founding member of the iSMART facility (Innovations in Surfaces Materials And Related Technologies), a new SST / NTU initiative serving as an interface between Academia and Industry, carrying out consultancies and direct research, funded by industry.

In the past, Dr Koutsogeorgis has served Nottingham Trent University as an Academic Board Member (2007-2010 and 2010-2013), a Health and Safety Adviser, a Direct Entry Admissions Tutor and a panel member on Course Validations. Also he has served as a University and College Union (UCU) official, with the roles of the Health and Safety Representative and a local NTU Committee Representative.

Career overview

Dr Koutsogeorgis graduated from the University of Ioannina, Greece, in 1997, with a BSc in Physics. He then moved to Nottingham Trent University as PhD candidate (Research Assistant) in the Electrical and Electronic Engineering Department and was awarded a PhD in 2003 ("Investigation of laser annealing of phosphor thin films for potential luminescent devices", Nottingham Trent University, 2003). He joined NTU in 2000 as a member of the research staff (Research Associate) funded by industry, and in 2002 he became a Lecturer. He had a short career break from August 2003 to September 2004 and upon return, he resumed teaching and research activity. In 2005 he became a Senior Lecturer and in 2013 he was promoted to Reader in Photonic Technologies, a post which he still holds.

Research areas

Dr Koutsogeorgis' research interest is in the area of Material Science. Specific areas of interest include thin film technology, laser processing, luminescent devices, plasmonics, electronic devices, smart coatings.

The materials and processes he is developing and studying have numerous applications in the area of nanotechnology, spanning several industries including those of photovoltaics, data storage, security and authentication, optoelectronics, thin film transistors, displays, optical coatings, laser machining and laser prototyping. Currently he is leading the Electronic and Photonic Materials Group. His research focuses on the areas of thin film technology for Plasmonics, Phosphors and the Semiconductor Industry (semiconducting oxides and transparent conducting materials). The main theme is Plasmonic thin films, a rapidly growing research area, demonstrating great potential for high societal impact in the near future. His research group benefits from long standing expertise in thin film technology and laser processing of thin films. The main focus of its work is in developing optical coatings comprising hard wearing and long lasting dielectric thin films with metal nanoparticles of controlled size and density embedded in them. He has developed, at NTU, a unique technology with which the group can achieve subsurface modification and control of the nanoparticles, (size and density,) for engineering the surface plasmon resonance phenomenon into applications. Also, phosphor thin films can be developed as the light emitting layer for electro-, cathode-, and photo- luminescent devices. Our unique laser processing technology provides durable thin film layers of phosphor materials with brighter light output and longer lifetime under a range of different excitations. Finally, development of oxide thin films for the semiconductor industry is concentrated around thin film materials suitable for transparent and flexible electronics. The laser processing technology is capable of controlling the properties of the thin film materials and result in the fine tuning of their semi-conducting characteristics. Since this is a low temperature process, it is compatible with low cost, flexible and transparent substrates.

Over the years, the techniques and materials shown below have been a subject of research, for the applications also listed :

Techniques

Deposition:

  • RF Magnetron Sputtering, HiTUS™ Sputtering, Thermal Evaporation, DC Magnetron Sputtering, Ink-Jet Printing, Electro-spinning

Processing:

  • Laser Annealing, Laser Cutting, UV Curing, Laser Sintering, Laser Drilling, Thermal Annealing, Laser Ablation, Laser Marking, Rapid Thermal Annealing

Optical Characterisation:

  • Optical Transmittance Spectroscopy (OTS), Electro-luminescence (EL), Optical Reflectance Spectroscopy (ORS), Photo-luminescence (PL), Surface Roughness, Cathodo-luminescence (CL), Variable Angle Spectroscopic Ellipsometry (VASE),Profilometry

Electrical Characterisation:

  • Capacitance (C-V), Conductance (G-V), Current (I-V), Sheet Resistance, Mobility, Carrier Density

Structural Characterisation:

  • X-Ray Diffraction (XRD), X-ray Photon Spectroscopy (XPS), X-Ray Reflection (XRR), Transmission Electron Microscopy (TEM), X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), Profilometry, Surface Roughness

Materials

Conductors:

  • Aluminium doped Zinc Oxide (AZO), Antimony doped Tin Oxide (ATO), Indium Tin Oxide (ITO), Gold (Au), Silver (Ag), Copper (Cu)

Semiconductors:

  • Indium Gallium Zinc Oxide (IGZO), Zinc Oxide (ZnO), Copper Indium Gallium Sulfide (CIGS), Zinc Sulfide (ZnS)

Dielectrics:

  • Y2O3, HfO2, ZrO, SiOxNy, SiO2, Al2O3, AlN

Phosphors:

  • ZnS:Mn, ZnS:Ag, ZnS:Cu, La2O2S:Tb, Gd2O2S:Tb, Y2O3:Eu, Y2O3:Tb

Applications

Plasmonic Nanoparticles:

  • SERS, Photovoltaics, Decorative coatings, Non Linear Optics, Security, Cryptography, Optical data storage, Light out-coupling

Electronic Displays:

  • Electro-luminescence, Light Emitting Diodes, Flexible Displays, Photo-luminescence, Head Mounted Displays, Transparent Displays, Cathodo-luminescence, Head UP Displays, Wearable Displays

Electronic Devices:

  • Transparent Conductors, Transparent Electronics, Thin Film Transistors, Flexible Electronics

Opportunities to carry out postgraduate work towards an MPhil / PhD exist and further information may be obtained from the NTU Graduate School.

External activity

Dr Koutsogeorgis is a member of the organising committee of the International Conference of Nanosciences & Nanotechnologies (workshop 2). He is a regular participant in other international research conferences like the E-MRS, MRS, TCM. Additionally he works closely with several industrial collaborators (internationally) with the aim of transferring knowledge gained in academic research into industrial production and, at the same time, to identify academic research directions that are relevant, current and with high industrial impact.

Publications

Growth and annealing strategies to control the microstructure of AlN:Ag nanocomposite films for plasmonic applications. Siozios A, Zoubos H, Pliatsikas N, Koutsogeorgis DC, Vourlias G, Pavlidou E, Cranton W and Patsalas P, Surface and Coatings Technology, 2014 (in press)

Influence of laser annealing on the structural properties of sputtered AlN:Ag plasmonic nanocomposites. Bazioti C, Dimitrakopulos GP, Kehagias T, Komninou P, Siozios A, Lidorikis E, Koutsogeorgis DC and Patsalas P, Journal of Materials Science, 2014, 49 (11), 3996-4006

Intrinsic photoluminescence from low temperature deposited zinc oxide thin films as a function of laser and thermal annealing. Tsakonas C, Cranton W, Li F, Abusabee K., Flewitt A, Koutsogeorgis D and Ranson R, Journal of Physics D: Applied Physics, 2013, 46 (9), 095305

Optical encoding by plasmon-based patterning: hard and inorganic materials become photosensitive. Siozios A, Koutsogeorgis DC, Lidorikis E, Dimitrakopulos GP, Kehagias T, Zoubos H, Komninou P, Cranton WM, Kosmidis C and Patsalas P, Nano Letters, 2012, 12 (1), 259-263

Laser annealing of thin film electroluminescent devices deposited at a high rate using high target utilization sputtering. Wakeham SJ, Tsakonas C, Cranton WM, Thwaites MJ, Boutaud G and Koutsogeorgis DC, Semiconductor Science and Technology, 2011, 26 (4:045016)

Photosensitivity and optical performance of hydrogenated amorphous carbon films processed by picosecond laser beams. Panagiotopoulos NT, Karras G, Lidorikis E, Koutsogeoegis DC, Kosmidis C and Patsalas P, Surface and Coatings Technology, 2011, 206 (4), 734-741

Performance enhancement of ZnS:Mn thin film electro luminescent devices by combination of laser and thermal annealing. Koutsogeorgis DC, Cranton WM, Ranson RM and Thomas CB, Journal of Alloys and Compounds, 2009, 483 (1-2), 526-529

Growth optimisation of ZnS:Mn thin film phosphors for high intensity miniature electroluminescent displays. Boutaud G, Cranton WM, Koutsogeorgis DC, Ranson RM, Tsakonas C and Thomas CB, Materials Science and Engineering B, 2009, 165 (3), 202-206

See all of Demosthenes Koutsogeorgis's publications...

Press expertise

  • Thin film technology
  • Laser processing
  • Photonic processing
  • Laser annealing
  • Phosphor thin films
  • Plasmonic thin films
  • Plasmonic nanoparticles