Design of an ultra-thin, multiband, micro-slot based terahertz metamaterial absorber

Abstract

An ultra-thin, multiband, micro-slot based metamaterial absorber is presented in this paper. The proposed unit cell is compact which is in the form of single-layer gold patch-gallium arsenide-ground package, involving four identical micro-slots. Using the micro-slots, the fundamental circular patch gains a multiband resonation skill, and the absorber operates at 1.16, 2.73, and 4.57 THz bands with near-perfect absorptivity. The absorption mechanism is discussed based on the electric and surface current distributions, and all outcomes are also validated by the effective medium approach. The proposed absorber is ultra-thin with a thickness of 2.6 µm, corresponding to ∼λ/100 at its lowest operation frequency. The unit cell indicates polarization-independent, and wide incident angle absorption spectra up to 40°, hence, the proposed absorber is a promising candidate as an absorbing platform for THz band imaging and sensing applications.

KEYWORDS:

• Metamaterial
• electromagnetic absorber
• terahertz
• sensors
• imagers

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Sinan Aksimsek

Sinan Aksimsek received his B.Sc. degree in Electrical and Electronics Engineering and his M.Sc. degree in Electronics and Telecommunication Engineering from Istanbul University and Istanbul Technical University, Istanbul, Turkey, in 2007 and 2010, respectively. He received his Ph.D. degree in Electronics Engineering from Gebze Technical University, Kocaeli, Turkey, in 2014. From 2015 to 2016, he was the Postdoctoral Research Fellow with the Department of Electronics and Nanoengineering, Aalto University, Finland. He is currently an Assistant Professor with the Department of Electrical and Electronics Engineering, İstanbul Kultur University, İstanbul, Turkey. His research interests include microwave and mm-Wave antenna technologies, printed and flexible RF devices, meta-surfaces/materials, electromagnetics of 2D materials and graphene plasmonics.