Au/Nb2O5 terahertz-gigahertz electro-optical filters designed for high frequency applications

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dc.authorscopusidAtef Fayez Hasan Qasrawi / 6603962677
dc.authorwosidAtef Fayez Hasan Qasrawi / R-4409-2019
dc.contributor.authorAlgarni, Sabah E.
dc.contributor.authorQasrawi, Atef Fayez Hasan
dc.contributor.authorKhusayfan, Najla M
dc.date.accessioned2025-04-18T10:05:42Z
dc.date.available2025-04-18T10:05:42Z
dc.date.issued2024
dc.departmentİstinye Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Elektrik-Elektronik Mühendisliği Bölümü
dc.description.abstractHerein enhanced broad band filters are fabricated by deposing thin films of Nb2O5 onto glass and semitransparent Au nanosheets using the ion coating technique. Remarkable enhancement in the surface roughness of the films and in the visible and infrared light absorption by more than 270% and 750%, respectively, is achieved by coating the films onto Au nanosheets. Au nanosheets redshifted the energy band gap and initiated the free carrier absorption in the Nb2O5 films. As terahertz band filters, Au/Nb2O5 interfaces exhibited higher dielectric constant, higher optical conductivity and higher terahertz cutoff frequency values. Au/Nb2O5 optical filters showed terahertz resonator characteristics displaying six resonance modes two, three and one of which are dominant in the infrared, visible and ultraviolet ranges, respectively. On the other hand the impedance spectroscopy analyses for Au/Nb2O5/Au (ANA) filter showed microwave resonator characteristics with cutoff frequency values reaching 700 GHz for signal carriers of driving frequency of 1.65 GHz. ANA devices exhibited negative capacitance effect in a wide range of driving frequency domain. The features of the Au/Nb2O5 films demonstrate their potential for use as gigahertz-terahertz broad band electro-optical resonators suitable for high frequency applications. © 2024 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
dc.identifier.citationAlgarni, S. E., Qasrawi, A. F., & Khusayfan, N. M. (2024). Au/Nb2O5 terahertz-gigahertz electro-optical filters designed for high frequency applications. Physica Scripta, 99(9), 095953.
dc.identifier.doi10.1088/1402-4896/ad6bfb
dc.identifier.issn00318949
dc.identifier.issue9
dc.identifier.scopus2-s2.0-85201679912
dc.identifier.scopusqualityQ1
dc.identifier.urihttp://dx.doi.org/10.1088/1402-4896/ad6bfb
dc.identifier.urihttps://hdl.handle.net/20.500.12713/6942
dc.identifier.volume99
dc.identifier.wosWOS:001292585400001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakScopus
dc.indekslendigikaynakWeb of Science
dc.institutionauthorQasrawi, Atef Fayez Hasan
dc.institutionauthoridAtef Fayez Hasan Qasrawi / 0000-0001-8193-6975
dc.language.isoen
dc.publisherInstitute of Physics
dc.relation.ispartofPhysica Scripta
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAu/Nb2O5
dc.subjectGigahertz
dc.subjectMicrowave Resonance
dc.subjectNegative Capacitance
dc.subjectTerahertz
dc.titleAu/Nb2O5 terahertz-gigahertz electro-optical filters designed for high frequency applications
dc.typeArticle

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