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Open AccessArticle

Perfect Absorption Efficiency Circular Nanodisk Array Integrated with a Reactive Impedance Surface with High Field Enhancement

Department of Electrical Engineering, University of Ulsan, Ulsan 44610, Korea
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Nanomaterials 2020, 10(2), 258; https://doi.org/10.3390/nano10020258
Received: 9 January 2020 / Revised: 30 January 2020 / Accepted: 31 January 2020 / Published: 2 February 2020
(This article belongs to the Special Issue Advances in Photonic and Plasmonic Nanomaterials)
Infrared (IR) absorbers based on a metal–insulator–metal (MIM) have been widely investigated due to their high absorption performance and simple structure. However, MIM absorbers based on ultrathin spacers suffer from low field enhancement. In this study, we propose a new MIM absorber structure to overcome this drawback. The proposed absorber utilizes a reactive impedance surface (RIS) to boost field enhancement without an ultrathin spacer and maintains near-perfect absorption by impedance matching with the vacuum. The RIS is a metallic patch array on a grounded dielectric substrate that can change its surface impedance, unlike conventional metallic reflectors. The final circular nanodisk array mounted on the optimum RIS offers an electric field enhancement factor of 180 with nearly perfect absorption of 98% at 230 THz. The proposed absorber exhibits robust performance even with a change in polarization of the incident wave. The RIS-integrated MIM absorber can be used to enhance the sensitivity of a local surface plasmon resonance (LSPR) sensor and surface-enhanced IR spectroscopy. View Full-Text
Keywords: infrared (IR) absorber; reactive impedance surface; electric field enhancement factor; absorption efficiency infrared (IR) absorber; reactive impedance surface; electric field enhancement factor; absorption efficiency
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Anam, M.K.; Choi, S. Perfect Absorption Efficiency Circular Nanodisk Array Integrated with a Reactive Impedance Surface with High Field Enhancement. Nanomaterials 2020, 10, 258.

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