Bismuth plasmonics for extraordinary light absorption in deep sub-wavelength geometries

buir.contributor.authorGhobadi, Amir
buir.contributor.authorBütün, Bayram
dc.citation.epage689en_US
dc.citation.issueNumber3en_US
dc.citation.spage686en_US
dc.citation.volumeNumber45en_US
dc.contributor.authorÖzbay, İ.
dc.contributor.authorGhobadi, Amir
dc.contributor.authorBütün, Bayram
dc.contributor.authorTurhan-Sayan, G.
dc.date.accessioned2021-03-04T05:31:55Z
dc.date.available2021-03-04T05:31:55Z
dc.date.issued2020
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractIn this Letter, we demonstrate an ultra-broadband metamaterial absorber of unrivaled bandwidth (BW) using extraordinary optical response of bismuth (Bi), which is the material selected through our novel analysis. Based on our theoretical model, we investigate the maximum metal–insulator–metal (MIM) cavity BW, achievable by any metal with known n-k data. We show that an ideal metal in such structures should have a positive real permittivity part in the near-infrared (NIR) regime. Contrary to noble and lossy metals utilized by most research groups in the field, this requirement is satisfied only by Bi, whose data greatly adhere to the ideal material properties predicted by our analysis. A Bi nanodisc-based MIM resonator with an absorption above 0.9 in an ultra-broadband range of 800 nm–2390 nm is designed, fabricated, and characterized. To the best of our knowledge, this is the broadest absorption BW reported for a MIM cavity in the NIR with its upper-to-lower absorption edge ratio exceeding best contenders by more than 150%. According to the findings in this Letter, the use of proper materials and dimensions will lead to realization of deep sub-wavelength efficient optical devices.en_US
dc.description.provenanceSubmitted by Zeynep Aykut (zeynepay@bilkent.edu.tr) on 2021-03-04T05:31:55Z No. of bitstreams: 1 Bismuth_plasmonics_for_extraordinary_light_absorption_in_deep_sub_wavelength_geometries.pdf: 1374003 bytes, checksum: 679e8d3001dd1c1e054ad67a9c50ba97 (MD5)en
dc.description.provenanceMade available in DSpace on 2021-03-04T05:31:55Z (GMT). No. of bitstreams: 1 Bismuth_plasmonics_for_extraordinary_light_absorption_in_deep_sub_wavelength_geometries.pdf: 1374003 bytes, checksum: 679e8d3001dd1c1e054ad67a9c50ba97 (MD5) Previous issue date: 2020en
dc.identifier.doi10.1364/OL.45.000686en_US
dc.identifier.issn0146-9592
dc.identifier.urihttp://hdl.handle.net/11693/75746
dc.language.isoEnglishen_US
dc.publisherOSA - The Optical Societyen_US
dc.relation.isversionofhttps://dx.doi.org/10.1364/OL.45.000686en_US
dc.source.titleOptics Lettersen_US
dc.titleBismuth plasmonics for extraordinary light absorption in deep sub-wavelength geometriesen_US
dc.typeArticleen_US

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