10.01.2018 Functional and Nonlinear Terahertz Metamaterials

Prof. Dr. Ibraheem Al-Naib, Biomedical Engineering Department, Imam Abdulrahman Bin Faisal University, Saudi Arabien

Zeit: Mittwoch, 17.01.2018, 15:00 Uhr
Ort: WZMW, Hans-Meerwein-Str. 6 (Lahnberge), Seminarraum 02D36

Abstract

Metamaterials (MTMs) are engineered composites of conducting resonant structures with sub-wavelength dimensions. Each fo these resonating elements forms a metaatom and one or multiple metaatoms form a unit cell, which defines the smallest element in a periodic array. These metaatoms can be designed to yield a required response at frequencies from the microwave through the visible.

The wide range of possible applications of today's terahertz (THz) technology is stimulating enormous attention from specialists in various fields such as security, quality control, sensing and telecommunications. It remained almot unexplored until recently due to the lack of efficient generation and detection techniques. Hence, the development of this technology depends on realizing efficient components with different functionalities.

In this talk, I will discuss common MTM designs and the various resonances that can be excited. To better understand the working principle of MTMs, near- and far-field coupling mechanisms on MTM resonators will be discussed. More importantly, some of the recently proposed functional THz metamaterials will be presented highlighting their strengths and weaknesses in comparison to existing approaches and providing a perspective on applications for THz MTM structures. Furthermore, a proof of concept for a new generation of ultrafast nonlinear terahertz metamaterials will be demonstrated.

Biography

Ibraheem Al-Naib is currently an assistant professor with Biomedical Engineering Department at Imam Abdulrahman Bin Faisal University, Saudi Arabia. He completed his Ph.D. from the Technische Universität Braunschweig, Braunschweig, Germany in 2009. From Sept. 2010 to July 2015, he has been a postdoctoral research fellow with the Institut National de la Recherche Scientifique and Queen's University in Canada. With more than 2300 citations, his current Hirsch (h-) index, build up over the past ten years, equals 28. He authored and coauthored over 140 papers published in prestigious international scientific journals and conference proceedings. Moreover, he has been invited to many international conferences including the NATO Advanced Research Workshop on Detection of Explosives and CBRN in 2012 and META'13. Furthermore, he served as a member of the program committee of the Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) Conference in 2013. He is an editorial board member of Journal of Millimeter, Infrared and Terahertz Waves. His current research interests include biomedical sensing, high-quality factor planar terahertz metamaterials and nonlinear terahertz response of graphene.