Home > Seminars > Seminar By Prof. Mourad Zghal
Teaching

Photonic Nanowires for Pulse Compression and Sensing Applications By Prof. Mourad Zghal (University of Carthage, Tunisia)

  • Class schedule:  Monday, March 30th, 2015 from 11:00 am to 12:00 pm
  • Location: Building 3, Room 5220

Abstract

The characterization and design of low loss photonic nanowires with diameters smaller than the wavelength of the guided light are investigated. In fact, driven by the potential applications in telecommunications including high bit-rate transmission, pulse compression, multi-wavelength and wavelength division multiplexing (WDM) optical sources, three major research trends have been performed.

We have proposed a new design of optical waveguide exhibiting high nonlinearities due to their small dimensions and large anomalous velocity dispersion region. We have also shown that photonic nanowires composed from highly nonlinear glasses of chalcogenide and tellurite, in addition to silica, are suitable waveguides for efficient soliton self-compression with low input pulse energies of sub-nJ level. Then, broadband coherent supercontinua (SC) with more than one octave spanning are generated. Moreover, new designs of mid-IR sources operating beyond 2 μm are proposed by tapering photonic crystal fibers yielding the generation of broadband mid-IR SC. We also proposed a design of a photonic nanowire that is well suited for an efficient and controlled interaction of guided light with matter for sensing applications.

This proposed design shows to be very attractive for compact, flexible, real-time and high sensitive refractometric sensing. Photonic nanowires are found to be suitable waveguides and very promising for mid-IR low-power devices and applications.

 

Biography

Mourad Zghal is a Professor at the University of Carthage, Tunisia. He received his Ph.D in electrical engineering from Tunis El-Manar University in 2000. His scientific activities are mainly focused on integrated optical devices, design and characterization of photonic crystal fibers, and nonlinear propagation of ultrashort laser pulses. He served at numerous program or steering committee of international scientific conferences. In addition to his research activities, Prof Zghal has been extremely active in promoting photonics in Tunisia and Africa. He is the co-founder in 2002 and actual president (2012-2015) of the Optical Society of Tunisia. He also co-founded in 2003 the African Laser Center, an organization encouraging exchange of researchers and students across Africa. He was elected as Vice President of the ICO International Commission for Optics (2014-2017). Prof Zghal has been awarded the 2008 ICO/ICTP Gallieno Denardo prize for “his original work in the development of numerical modelling techniques for photonic crystal fibres, and for his active commitment aimed at the diffusion of research in optics in Africa”. Prof Zghal is research associate of the AbduSalam International Centre for Theoretical Physics ICTP, senior member of OSA and Fellow of SPIE.