Fractal Metasurface Absorbers with Octave-Spanning Bandwidth

Kenney, M. , Grant, J. , Shah, Y. D. , Escorcia-Carranza, I. , Humphreys, M. and Cumming, D. (2017) Fractal Metasurface Absorbers with Octave-Spanning Bandwidth. Nanophotonics and Micro/Nano Optics International Conference (Nanop 2017), Barcelona, Spain, 11-13 Sep 2017.

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Synthetic fractals offer a degree of freedom for varying resonance frequency, and are an ideal candidate for broadband absorbing devices – especially in the terahertz (THz) band where there is a lack of naturally absorbing materials. Metasurface absorbers often suffer from poor broadband performance, whilst strongly-absorbing broadband devices are typically complex multilayer structures [1,2]. Here, we overcome this limitation by developing an ultra-broadband metasurface absorber based on fractal cross resonators [3], capable of experimentally achieving one Optical Octave bandwidth and peak absorption of 93%. We attribute this to a novel absorption mechanism based on both Salisbury screen and anti-reflection responses. Such work is beneficial in realising THz blackbody absorbers, and for bolometric sensing capabilities.

Item Type:Conference or Workshop Item
Keywords:Metasurfaces, absorber, metamaterial, fractal.
Glasgow Author(s) Enlighten ID:Cumming, Professor David and Humphreys, Mark and Grant, Dr James and Shah, Dr Yash Diptesh and Kenney, Dr Mitchell Guy and Escorcia Carranza, Dr Ivonne
Authors: Kenney, M., Grant, J., Shah, Y. D., Escorcia-Carranza, I., Humphreys, M., and Cumming, D.
Subjects:Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Research Group:Microsystem Technology Group
Copyright Holders:Copyright © 2017 The Authors
Publisher Policy:Reproduced with the permission of the Authors
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
588331Triple wavelength superspectral camera focal-plane array (SUPERCAMERA)David CummingEngineering and Physical Sciences Research Council (EPSRC)EP/J018678/1ENG - ENGINEERING ELECTRONICS & NANO ENG