His current research interests lie in the theory of optical waveguides, which include complex mediums, fiber and integrated optics, fiber optic devices, optical sensors and metamaterial properties. He has published over two hundred forty five research papers in peer-reviewed international journals and conference proceedings; contributed chapters to sixteen research level books; edited and co-edited seven research level books in these areas. He is the reviewer for nearly three dozen research journals. Also, he serves the Editorial Board of International Journal of Humanitarian Technology (Inderscience Publishers, Switzerland). He is the Section Editor of Optik – International Journal for Light and Electron Optics (Elsevier, The Netherlands) and the Editor-in-Chief of the Journal of Electromagnetic Waves and Applications (Taylor & Francis, UK). He is Senior Member of the Institute of Electrical & Electronics Engineers (IEEE), the Optical Society of America (OSA), and the Society of Photo-Optical and Instrumentation Engineers (SPIE).