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    Item type:Publication, Access status: without files ,
    All-dielectric metasurfaces for infrared absorption spectroscopy applications
    (IEEE, 2019-05)
    Leitis, Aleksandrs
    ;
    Tittl, Andreas
    ;
    Liu, Mingkai
    ;
    Yesilkoy, Filiz
    ;
    Choi, Duk-Yong
    We present a nanophotonic method capable of detecting mid-infrared molecular fingerprints without the need for spectrometry, frequency scanning, or moving mechanical parts. We leverage dielectric metasurfaces featuring ultra-sharp resonances each tuned to discrete frequencies, enabling us to sample molecular absorption signatures over the mid-IR spectral range.
    Publicationtype: Conference Paper
      7
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    Item type:Publication, Access status: without files ,
    Imaging-based molecular barcoding with pixelated dielectric metasurfaces
    (American Association for the Advancement of Science (Assoc.), 2018-06-08)
    Tittl, Andreas
    ;
    Leitis, Aleksandrs
    ;
    Liu, Mingkai
    ;
    Yesilkoy, Filiz
    ;
    Choi, Duk Yong
    Metasurfaces provide opportunities for wavefront control, flat optics, and subwavelength light focusing.We developed an imaging-based nanophotonic method for detecting mid-infrared molecular fingerprints and implemented it for the chemical identification and compositional analysis of surface-bound analytes. Our technique features a twodimensional pixelated dielectric metasurface with a range of ultrasharp resonances, each tuned to a discrete frequency; this enables molecular absorption signatures to be read out at multiple spectral points, and the resulting information is then translated into a barcodelike spatial absorption map for imaging. The signatures of biological, polymer, and pesticide molecules can be detected with high sensitivity, covering applications such as biosensing and environmental monitoring. Our chemically specific technique can resolve absorption fingerprints without the need for spectrometry, frequency scanning, or moving mechanical parts, thereby paving the way toward sensitive and versatile miniaturized midinfrared spectroscopy devices.
    Publicationtype: Journal Article
      15