I have been a member of the EEE Department since 1985 as part of the Optoelectronics Research Group, now the Centre for Microsystems and Photonics. Prior to this, I worked on integrated optics research at Glasgow University for fibre optic communication systems. Since 1985, my research has involved areas such as fibre optic components, evanescent wave sensors, laser spectroscopy, photoacoustic spectroscopy and fibre laser systems.
I have taught several undergraduate courses including analogue and digital electronics and supervised many undergraduate projects in photonics. Over the years I have been closely involved with the management of the joint undergraduate course in electrical and mechanical engineering and currently I am deputy chair of the departmental courses and teaching committee.

• Tunable diode laser spectroscopy
• Optical fibre sensors

• George Stewart, Gillian Whitenett, Suresh Sridaran and V Karthik, "Investigation of the Dynamic Response of Erbium Fibre Lasers With Potential Application for Sensors," IEEE Journal of Lightwave Technology, vol. 25 (7), pp. 1786-1796, 2007. DOI: 10.1109/JLT.2007.899192
• Mohammad A. Mirza and George Stewart, "Multi-wavelength operation of erbium-doped fibre lasers by periodic filtering and phase modulation," IEEE Journal of Lightwave Technology, vol. 27 (8), pp. 1034-1044, 2009. DOI: 10.1109/JLT.2008.2009160
• George Stewart, Walter Johnstone, James R. P. Bain, Keith Ruxton and Kevin Duffin, "Recovery of Absolute Gas Absorption Line Shapes Using Tuneable Diode Laser Spectroscopy with Wavelength Modulation - Part 1: Theoretical Analysis," IEEE Journal of Lightwave Technology, vol. 29 (6), pp. 811-821, 2011. DOI: 10.1109/JLT.2011.2107312
• Jonas K. Valiunas, George Stewart and Gautam Das, "Detection of Nitrous Oxide (N2O) at sub-ppmv using Intracavity Absorption Spectroscopy (ICAS)," IEEE Photonics Technology Letters, vol. 28 (3), pp. 359-362, 2016. DOI: 10.1109/LPT.2015.2496250