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Abdulhalim, Ibrahim

Prof.  Ibrahim  Abdulhalim

Ben Gurion University
Ilse Katz Institute for Nanoscale Science and Technology
Department of Electrooptic Engineering

Beer Sheva   84105

tel: +972-(0)8-6479803 / 6461448
fax: +972-(0)8-6479494
E-mail: abdulhlm@bgu.ac.il
Web: http://www.bgu.ac.il/~abdulhlm/

Area of Expertise

Biomedical optical imaging, liquid crystal devices, surface plasmon resonance sensors


Professor Ibrahim Abdulhalim: Graduated from the Technion, Haifa, where he received his B.Sc, M.Sc and D.Sc in 1982, 1985 and 1988 in Physics respectively working on the optics of liquid crystals and Raman scattering from amorphous materials. He has worked in research and development in variety of academic institutions and industrial companies. From August 1988 till May 1991, he was a research associate within the Optoelectronic Computing Systems Center in the University of Colorado at Boulder, USA where he worked on ferroelectric liquid crystal spatial light modulators. During July 1991 till July 1993 he was a research fellow in the Optoelectronics Research Center of Southampton University, England, working on fiber acousto-optic modulators for Q-switching and Mode-locking of fiber lasers. During 2000-2001 he was with the Thin Films Center of the University of Western Scotland as a researcher and lecturer. Among the companies he worked for are: KLA-Tencor and Nova measuring instruments, working in optical metrology systems for the inspection of the fabrication processes in the microelectronics industry, in GWS-Photonics working on guided wave liquid crystal devices for optical telecommunications. Since October 2005 he joined the Department of Electrooptic Engineering at Ben Gurion University. His current research activities involve: liquid crystal devices, nanophotonic and plasmonic structures for biosensing, improved biomedical optical imaging techniques such as spectropolarimetric imaging and full field optical coherence tomography using liquid crystal devices. Prof. Abdulhalim has published over 110 journal articles, 50 conference proceedings papers, 8 book chapters, coauthored one book on integrated nanophotonic devices, coediting another book on optical biosensing and has over 10 patents. He became a fellow of the Institute of Physics, UK in 2004 and SPIE fellow in 2011. He is an associate editor of the SPIE Journal of NanoPhotonics and for the Journal of Physics Express. Prof. Abdulhalim is acting as the head of Department of Electrooptic Engineering since 2007. The Department has over 120 graduate students, offering both M.Sc and Ph.D programs.

Lecture Title(s)

Biomedical optical imaging assisted by liquid crystal devices

Liquid crystal devices are under extensive study for photonic and optical non-display applications. One of the important areas where they can significantly improve applications is in optical imaging in which they can function as spatial light modulators for wavefront correction, tunable filtering, tunable focusing and polarization control. Recently we have been investigating liquid crystal devices for this special purpose for biomedical imaging applications. Several novel devices will be described and their integration into the specific system:
1. Discrete wavelength tunable filter
2. Continuous high dynamic tunable filter
3. Continuous wavelength independent polarization rotator
Spectropolarimetric imaging system that uses these devices will be described with application for skin cancer detection. In addition using a fast liquid crystal phase modulator we developed an ultra-high resolution full field optical coherence microscope capable of observing 3D microbiological structures as small as 0.4x0.4x1.0 μm3 (xyz) using quasi monochromatic light.

Enhancing the performance of surface plasmon resonance sensors

Surface plasmon resonance (SPR) sensors based on extended SP waves are a mature technology for more than two decades now, however recent investigations show continuous enhancement of their sensitivity and their lower detection limit. Together with the recent investigations in localized SPR phenomena, extraordinary optical transmission through nanoapertures in metals, and surface enhanced spectroscopies, drastic developments are expected to revolutionize the field of optical sensing. Sensitivity enhancement techniques based on SPR phenomena will be reviewed focusing both on the physical transduction mechanisms and the system performance. It is shown that in the majority of cases the sensitivity enhancement is associated with the enhancement of the electromagnetic field overlap integral describing the electromagnetic interaction energy within the analyte. Other important mechanisms that play a role in the sensitivity enhancement are the interaction between plasmons and excitons and the interaction between the analyte molecules and the metal surface.

Examples will be given starting from the well known Kretschmann configuration through the addition of high index dielectric thin film to the metal, the addition of gratings, the use of nanoSculptured thin films (nanoSTFs) and enhanced transmission of nanoslits. Special attention will be given to nanoSTFs which are assemblies of shaped, parallel and tilted nanorods, prepared using many variants of the basic Oblique Angle Deposition (OAD) technique. Because of the special shapes and nanoscale dimensions of STFs, they exhibit a great potential in the biosensing field. The fact that the nanofeatures composing these films have a Localized Surface Plasmon Resonances (LSPR) which fall in the VIS-NIR range, gave these structures the property of enhancing significantly the electromagnetic field in their vicinity. Enhancing the field by some orders of magnitude leads to amplification of many interesting optical phenomena such as fluorescence and Surface Enhanced Raman Scattering (SERS).

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