Tunable Wave Isolators Based on Space-time Modulated Graphene Sheets

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorWang, Xuchenen_US
dc.contributor.authorDiaz-Rubio, Anaen_US
dc.contributor.authorLi, Huananen_US
dc.contributor.authorAlu, Andreaen_US
dc.contributor.departmentDept Signal Process and Acousten_US
dc.contributor.departmentDepartment of Electronics and Nanoengineeringen_US
dc.contributor.departmentCity University of New Yorken_US
dc.date.accessioned2020-04-28T06:58:09Z
dc.date.available2020-04-28T06:58:09Z
dc.date.issued2019-06-01en_US
dc.description| openaire: EC/H2020/736876/EU//VISORSURF
dc.description.abstractIn this talk, we propose a tunable metasurface isolator based on space-time (ST) modulated surface impedance. The surface impedance is synthesized by periodic graphene strips with spatiotemporal gating. General and rigorous analytical formulations are developed to calculate all the scattering harmonics for such modulated metasurfaces. We found that with the space modulation of the graphene impedance, the structure can excite evanescent modes that propagate asymmetrically in space. This spatial asymmetry results in strong nonreciprocal effect under time modulation: the device can reflect waves coming from one angle without frequency conversion, while for the oppositely tilted incidence, waves are fully transformed into evanescent fields and absorbed. We also show that the proposed wave isolator can be tuned and robustly operate in a wide frequency spectrum (5.5 12.1 THz) only by modifying the pumping functions.en
dc.description.versionPeer revieweden
dc.format.extent8
dc.format.extent763-770
dc.identifier.citationWang , X , Diaz-Rubio , A , Li , H & Alu , A 2019 , Tunable Wave Isolators Based on Space-time Modulated Graphene Sheets . in 2019 PhotonIcs and Electromagnetics Research Symposium - Spring, PIERS-Spring 2019 - Proceedings . , 9017667 , Progress in Electromagnetics Research Symposium , vol. 2019-June , IEEE , pp. 763-770 , Progress in Electromagnetics Research Symposium , Rome , Italy , 17/06/2019 . https://doi.org/10.1109/PIERS-Spring46901.2019.9017667en
dc.identifier.doi10.1109/PIERS-Spring46901.2019.9017667en_US
dc.identifier.isbn9781728134031
dc.identifier.issn1559-9450
dc.identifier.issn1931-7360
dc.identifier.otherPURE UUID: b2a7f699-bab2-49c0-bf58-b0b13759a2c0en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/b2a7f699-bab2-49c0-bf58-b0b13759a2c0en_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85082019699&partnerID=8YFLogxKen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/43910
dc.identifier.urnURN:NBN:fi:aalto-202306053555
dc.language.isoenen
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/736876/EU//VISORSURFen_US
dc.relation.ispartofProgress in Electromagnetics Research Symposiumen
dc.relation.ispartofseries2019 PhotonIcs and Electromagnetics Research Symposium - Spring, PIERS-Spring 2019 - Proceedingsen
dc.relation.ispartofseriesProgress in Electromagnetics Research Symposiumen
dc.relation.ispartofseriesVolume 2019-Juneen
dc.rightsrestrictedAccessen
dc.titleTunable Wave Isolators Based on Space-time Modulated Graphene Sheetsen
dc.typeConference article in proceedingsfi
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