Invited Speakers : Dr. WALEED MOHAMMED

Bangkok University, Thailand.

Invited speaker:

department of  school of Engineering, Bangkok University as a research scholar.


Utilization of optical scattering by ZnO nano-rods for vapor sensing through side coupling to optical fibers


This take summarizes the research work developed at the micro-photonics laboratory at Bangkok University in collaboration with several partners in the field of optical sensors based on nanotechnology. The growth of Zinc Oxide (ZnO) nano-rods is optimized over both rounded surface (optical fiber) to maximize optical scattering. The nano-rods parameters are controlled through the seeding concentration and growth time. The large surface area of the rods allows the proposed structure to be applied for vapor detection. The research work covers three different fibers: single mode fiber, multimode silica fiber and plastic optical fiber. Different conditions were applied to each fiber. Structuring the growth around plastic optical fiber has been studied to enhance the sensitivity working under extended light source.


  • In 1996, graduated from the department of electronics and electrical communications, Faculty of Engineering, Cairo University, Giza, Egypt with a major in control systems.
  •  In 1997, he joined the Lasers institute (NILES), Cairo University as a teaching assistant. He received M.Sc. degree from the department of computer engineering, Cairo University under the supervision of Prof. Adel El-Nadi and Prof. Ali Fahmy
    in 1999. In the same year he joined the College of optics and photonics/CREOL, University of Central Florida, Orlando, FL, USA as a research assistant.
  • In 2001, he received M.Sc. degree in optics.
  • in 2001. He completed his Ph.D. work.
  • in 2004 and his thesis was titled “nano/micro optical elements for mode coupling applications.
  • In 2004, he joined Prof. P. W. E. Smith’s ultra-fast photonics laboratory (UPL), Electrical and Computer Engineering department, University of Toronto, as a postdoctoral fellow.
  • In 2005, he joined Prof. Li Qian’s group at the same University.
  • In 2007 Dr. Mohammed joined the International school of engineering, Chulalongkorn University, Bangkok, Thailand as an instructor in the nano-engineering department. He taught optoelectronics, fundamental of optics, numerical modeling, nano-electronics and research methodology.
  • As of September 2010, He joined the school of Engineering, Bangkok University as a research scholar.


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