Journal
OPTICS EXPRESS
Volume 27, Issue 15, Pages 20886-20900Publisher
Optica Publishing Group
DOI: 10.1364/OE.27.020886
Keywords
-
Categories
Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/J018678/1, EP/M01326X/1]
- EPSRC [EP/J018678/1, EP/M01326X/1] Funding Source: UKRI
Ask authors/readers for more resources
Metamaterial absorbers have been a topic of considerable interest in recent years, with a particular focus on Terahertz (THz) frequencies due to many natural materials having a weak interaction with THz light. Great efforts have aimed to expand such THz absorbers to cover a wide bandwidth whilst also being highly efficient. However, many of these require cascaded or stacked multilayer resonant elements, where even a small deviation in the alignment between layers is extremely detrimental to the performance. Here, we propose a bilayer metasurface absorber (thickness similar to lambda/6) that is immune to such layer misalignments capable of exceeding a fractional bandwidth (FWHM) of 100% of the central frequency. The design works due to a novel absorption mechanism based on Salisbury Screen and anti-reflection absorption mechanisms, using fractal cross absorbers to expand the bandwidth. Our work is of particular benefit to developing devices which require ultra-wide bandwidth, such as bolometric sensing and planar blackbody absorbers, with the extremely robust absorption responses being unaffected by any misalignments between layers - a limiting factor of previous absorbers. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available