Abstract
Metamaterial absorbers display potential applications in the field of photonics and have been investigated extensively during the last decade. We propose a dual-band resonant metamaterial absorber with right-angle shaped elements (RAEs) in the terahertz range based on numerical simulations. The absorber remains insensitive to a wide range of incidence angles (0°–70°) by showing a minimum absorbance of ~80% at 70°. Furthermore, the proposed absorber is highly independent on any state of polarization of the incidence electromagnetic wave due to the high absorbance, i.e., greater than 80%, recorded for the considered polarization states. To further comprehend the slight variations in absorbance as a function of change in the angle of incidence, the impedance of the structure has been critically examined. The metamaterial absorber is simple in design, and we provide a possible path of fabrication.
Highlights
The recent surge in the study of terahertz-based metamaterials is due to their unusual electromagnetic (EM) behavior [1, 2] and unique applications [3]
One of the challenges for designing or fabricating a metamaterial absorber is to keep a relatively high absorbance with respect to the change in incidence as well as polarization angles within a certain range of frequencies [35]
The right-angle shaped elements (RAEs) are aligned in such a way that the state of polarization of an incidence THz wave has a minimum effect on the performance of the absorber
Summary
Photonic Sensors ultrathin [21], dual-band [22,23,24], and triple-band absorbers [25, 26], have been studied. One of the challenges for designing or fabricating a metamaterial absorber is to keep a relatively high absorbance with respect to the change in incidence as well as polarization angles within a certain range of frequencies [35]. We propose a design of a dual-band metamaterial absorber in the terahertz range based on finite element method simulations. The proposed absorber is simple in design which consists of right-angle shaped elements at a top surface and a metallic layer of aluminum (Al) at the bottom. The use of Al and TiO2 in the design indicates an easy route of manufacturing the absorber. This is due to the fact that both Al and TiO2 are commonly used materials in most fabrication processes
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
