Broadband LWIR and MWIR metamaterial absorbers with a simple design topology: Almost perfect absorption and super-octave band operation in MWIR band

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dc.contributor.authorÜstün, Kadir
dc.contributor.authorTurhan Sayan, Gönül
dc.date.accessioned2019-05-13T08:57:45Z
dc.date.available2019-05-13T08:57:45Z
dc.date.issued2017
dc.departmentHitit Üniversitesi, Mühendislik Fakültesi, Elektrik Elektronik Mühendisliği Bölümü
dc.description.abstractInfrared absorbers are essential structures in the design of thermal emitters and thermal infrared imagers. In this study, we propose simple topologies of wideband metamaterial absorbers operating in the long-wave infrared or in the mid-wave infrared (MWIR) wavelengths of the electromagnetic spectrum where the atmosphere shows transparent behavior. Suggested metamaterial absorbers are mostly thin structures that consist of three functional layers from top to bottom: a periodically patterned metal layer, a planar dielectric layer, and a ground metal layer. The pattern of the top metal layer is four-fold symmetric to guarantee the polarization insensitivity of the absorber under normal incidence of light. In addition, a geometrically simple metamaterial pattern is preferred to facilitate the process of lithography. As titanium is known to be a high-loss metal, it is deliberately used at the top layer of the absorber to increase the overall absorption bandwidth. Highly satisfactory absorber results, such as almost perfect absorption and super-octave band operation are demonstrated, especially in the MWIR region. As oxidation of the top titanium layer may cause performance degradation in long-term use, a design modification is also suggested where a very thin protective coating layer is applied over the titanium metasurface. © 2017 Optical Society of America.
dc.identifier.citationÜstün, K., Turhan Sayan, G. (2017). Broadband LWIR and MWIR metamaterial absorbers with a simple design topology: almost perfect absorption and super-octave band operation in MWIR band. Journal of the Optical Society of America B: Optical Physics, 34(7), D86-D94.
dc.identifier.doi10.1364/JOSAB.34.000D86
dc.identifier.endpageD94en_US
dc.identifier.issn0740-3224
dc.identifier.issue7en_US
dc.identifier.scopusqualityQ2
dc.identifier.startpageD86en_US
dc.identifier.urihttps://doi.org/10.1364/JOSAB.34.000D86
dc.identifier.urihttps://hdl.handle.net/11491/999
dc.identifier.volume34en_US
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOSA - The Optical Society
dc.relation.ispartofJournal of the Optical Society of America B: Optical Physics
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subject[Belirlenecek]en_US
dc.titleBroadband LWIR and MWIR metamaterial absorbers with a simple design topology: Almost perfect absorption and super-octave band operation in MWIR band
dc.typeArticle

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