Ibraheem Al-Naib

Ibraheem Al-Naib received his B.Sc. and M.Sc. degrees with honors in elctronics and communication engineering from University of Mosul, Iraq in 1993 and 1996, respectively. Then, he worked as a computer engineer until 2003 in Iraq and UAE. In 2003, he joined Sharjah university in United Arab Emirates as a lecturer. In Oct. 2005, he started his Ph.D. studies at TU Braunschweig, Germany afer getting DAAD scholarship. He graduated with distinction (summa cum laude) in Dec. 2009. He was a postdoctoral fellow at Marburg university, Marburg, Germany for the first seven months of 2010. Starting from Sept. 2010, he is a postdoctoral fellow at INRS-EMT. His research interests include studying semiconductors at intense THz field and novel metamaterial structures with linear and nonlinear schemes at THz frequencies.



1. High Q-factor metasurfaces and thin-film sensing with planar metamaterial resonators.

2. Semiconductor investigation under intense THz fields.

3. Nonlinear THz metamaterials.


Prizes and Awards


Amount (CAD)


2011 80 000 

Postdoctoral fellowship from Natural Sciences and Engineering Research Council of Canada

2008 500

Student grant for attending the European Microwave Conference 2008, The Netherlands.

2007 1200

 Student grant for attending the Metamaterials 2007 Congress, Italy

2006/2007 8000

Five travel grants from European school of antennas (Italy, France, Finland, and   Sweden).

2005 105 000

German Academic Exchange Service (DAAD) scholarship for PhD study.

1993 150 

President’s award for achieving the first rank in the engineering college in 1993 at Mosul University-Iraq. 




















Recent Publications

1. “Observing metamaterial induced transparency in individual Fano resonators with broken symmetry” R. Singh, I.A.I. Al-Naib, Y. Yang, D. R. Chowdhury, W. Cao, T. Ozaki, R. Morandotti, and W. Zhang Applied Physics Letters, 99, 201107 (2011).


2. "Membrane metamaterial resonators with a sharp resonance: A comprehensive study towards practical terahertz filters  and sensors" Y. Chen, I. A. I. Al-Naib, J. Gu, M. Wang, T. Ozaki, R. Morandotti, and W. Zhang AIP Advances 2, 022109 (2012).


3. "Excitation of a high-Q subradiant resonance mode in mirrored single-gap asymmetric split ring resonator terahertz   metamaterials" I. Al-Naib, R. Singh, C. Rockstuhl, F. Lederer, S. Delprat, D. Rocheleau, M. Chaker, T. Ozaki, and R. Morandotti Applied Physics Letters 101, 071108 (2012).


4. (Invited) "Enhanced Q-factor in Optimally Coupled Macrocell THz Metamaterials: Effect of Spatial Arrangement" I. Al-Naib, R. Singh, M. Shalaby, T. Ozaki, and R. Morandotti IEEE Journal of Selected Topics in Quantum Electronics, in press.


5. "Carrier density dependence of the nonlinear absorption of intense THz radiation in GaAs" G. Sharma, I. Al-Naib, H. Hafez, R. Morandotti, D. G. Cooke, and T. Ozaki
Optics Express, Vol. 20, No. 16, pp. 18016-18024, 2012.




Ultrafast Optical Processing Group
INRS-EMT Université du Québec
1650 Boul. Lionel Boulet, Varennes QC  J3X 1S2,Canada
Tel. : +1 450 929-8202,   Fax. :  +1 450 929-8102.


<hrdata-mce-alt="Research Project" class="system-pagebreak" title="Research Project" />

Research Project

Ultra-Sharp Resonances in THz Metamaterials:

The performance of conventional metamaterial designs typically suffers from low quality (Q-) factors owing to ohmic and radiation losses. Hence, a drastic improvement is desired that can be achieved by novel and innovative structures for metamaterial unit cells. Asymmetric double split ring resonators (aDSRs) have been proposed at microwave and terahertz frequencies in order to achieve high Q-factors in a planar structure [1]. In this project, we show that a super cell made from four mirrored asymmetric single split ring resonators (mASRs) sustains an ultra-sharp inductive capacitive (LC) resonance feature that arises from the antiparallel currents excited in pairs of mASRs [2]. 



Fig. 1. (a) Simulated and (b) measured transmission spectra for the non-mirrored ASRs (dotted lines) and mirrored ASRs (solid lines) super cells. The insets in (b) depict the fabricated super cells with the electric (E) field orientation vertically polarized along the y-axis.



Figure 1 shows the measured and simulated results for the non-mirrored (dotted lines) and mirrored (solid lines) structures. The insets depict the unit cells of the fabricated structures when they are illuminated by an electric field polarized along the y-axis. The simulations agree quite well with the measurements. The results reveal a broad resonance for the non-mirrored metamaterial configuration with a full-width half-maximum (FWHM) bandwidth of 95 GHz and a Q-factor of 7.8. Interestingly, the mirrored design shows a much sharper resonance response, featured by a FWHM bandwidth of 29 GHz and a Q-factor of 24.2, which is nearly three times higher than that of the non-mirrored macrocell. This design concept can be applied for highly sensitive thin-film sensors, filters, and strong light matter interaction applications.


[1] V. A. Fedotov, M. Rose, S. L. Prosvirnin, N. Papasimakis, and N. I. Zheludev, “Sharp trapped-mode resonances in planar metamaterials with a broken structural symmetry,” Physical Review Letters, vol. 99, p. 147401, 2007.

[2] I. Al-Naib, R. Singh, C. Rockstuhl, F. Lederer, S. Delprat, D. Rocheleau, M. Chaker, T. Ozaki, and R. Morandotti, “Excitation of a high-Q subradiant resonance mode in mirrored single-gap asymmetric split ring resonator terahertz metamaterials,” Applied Physics Letters, vol. 101, no. 7, p. 071108, 2012.