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Photocurrent detection of radially polarized optical vortex with hot electrons in Au/GaN

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cam.depositDate2022-05-16
cam.issuedOnline2022-05-16
dc.contributor.authorHou, Y
dc.contributor.authorKappers, M
dc.contributor.authorJin, C
dc.contributor.authorOliver, R
dc.contributor.orcidHou, Y [0000-0001-9461-3841]
dc.contributor.orcidOliver, R [0000-0003-0029-3993]
dc.date.accessioned2022-05-16T23:30:51Z
dc.date.available2022-05-16T23:30:51Z
dc.date.issued2022
dc.date.updated2022-05-16T13:09:24Z
dc.description.abstract<jats:p>We report a GaN based metal–semiconductor–metal (MSM) infrared photodetector enabled with azimuthally distributed sub-wavelength gratings fabricated on one of the working electrodes. Under illumination, hot electron transfer is introduced by the plasmonic resonance in the infrared waveband formed at the interface of Au/GaN. Without the help of using any external optical polarizers, the device is able to detect radial polarization vortices in the form of photocurrents with a prescribed response spectrum. The detector exhibits a 10%–90% rise and fall time of 0.9 ms under modulated light, much faster than that of conventional ultraviolet GaN MSM photodetectors based on the band edge absorption. This work provides a viable way to measure spatially variant polarization beams with a compact plasmonic photodetectors fabricated from wide bandgap semiconductors.</jats:p>
dc.identifier.doi10.17863/CAM.84632
dc.identifier.eissn1077-3118
dc.identifier.issn0003-6951
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/337214
dc.language.isoeng
dc.publisherAIP Publishing
dc.publisher.departmentDepartment of Materials Science And Metallurgy
dc.publisher.urlhttp://dx.doi.org/10.1063/5.0094454
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject51 Physical Sciences
dc.subject40 Engineering
dc.subject4018 Nanotechnology
dc.titlePhotocurrent detection of radially polarized optical vortex with hot electrons in Au/GaN
dc.typeArticle
dcterms.dateAccepted2022-05-04
prism.endingPage202101
prism.issueIdentifier20
prism.publicationDate2022
prism.publicationNameApplied Physics Letters
prism.startingPage202101
prism.volume120
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/M010589/1)
pubs.funder-project-idEPSRC (via University of Sheffield) (unknown)
pubs.funder-project-idEPSRC (via University College London (UCL)) (EP/T028475/1)
pubs.licence-display-nameApollo Repository Deposit Licence Agreement
pubs.licence-identifierapollo-deposit-licence-2-1
rioxxterms.typeJournal Article/Review
rioxxterms.versionVoR
rioxxterms.versionofrecord10.1063/5.0094454

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