A room-temperature mid-infrared photodetector for on-chip molecular vibrational spectroscopy

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dc.citation.articleNumber101105
dc.citation.issueNumber10
dc.citation.journalTitleApplied Physics Letters
dc.citation.volumeNumber113
dc.contributor.authorZheng, Bob
dc.contributor.authorZhao, Hangqi
dc.contributor.authorCerjan, Ben
dc.contributor.authorYazdi, Sadegh
dc.contributor.authorRinge, Emilie
dc.contributor.authorNordlander, Peter
dc.contributor.authorHalas, Naomi J.
dc.contributor.orgLaboratory for Nanophotonics
dc.date.accessioned2018-11-01T19:40:04Z
dc.date.available2018-11-01T19:40:04Z
dc.date.issued2018
dc.description.abstractInfrared (IR) photodetection is of major scientific and technical interest since virtually all molecules exhibit characteristic vibrational modes in the mid-infrared region of the spectrum, giving rise to molecular spectroscopy and chemical imaging in this wavelength range. High-resolution IR spectroscopies, such as Fourier Transform IR spectroscopy, typically require large, bulky optical measurement systems and expensive photodetector components. Here, we present a high-responsivity photodetector for the mid-IR spectral region which operates at room temperature. Fabricated from silicon and aluminum, the photodetection mechanism is based on free carrier absorption, giving rise to a photoresponse rivalling commercially available cooled IR photodetectors. We demonstrate that infrared spectra of molecules deposited on this detector can be obtained by a direct electrical read-out. This work could pave the way for simple, fully integrated chemical sensors and other applications, such as chemical imaging, which would benefit from the combination of mid-IR detection, room-temperature operation, and ultracompact portability.
dc.identifier.citationZheng, Bob, Zhao, Hangqi, Cerjan, Ben, et al.. "A room-temperature mid-infrared photodetector for on-chip molecular vibrational spectroscopy." <i>Applied Physics Letters,</i> 113, no. 10 (2018) AIP Publishing: https://doi.org/10.1063/1.5045663.
dc.identifier.doihttps://doi.org/10.1063/1.5045663
dc.identifier.urihttps://hdl.handle.net/1911/103287
dc.language.isoeng
dc.publisherAIP Publishing
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleA room-temperature mid-infrared photodetector for on-chip molecular vibrational spectroscopy
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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