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Angle-multiplexed all-dielectric metasurfaces for broadband molecular fingerprint retrieval

Science advances, 2019-05, Vol.5 (5), p.eaaw2871-eaaw2871 [Peer Reviewed Journal]

Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). 2019 The Authors ;ISSN: 2375-2548 ;EISSN: 2375-2548 ;DOI: 10.1126/sciadv.aaw2871 ;PMID: 31123705

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  • Title:
    Angle-multiplexed all-dielectric metasurfaces for broadband molecular fingerprint retrieval
  • Author: Leitis, Aleksandrs ; Tittl, Andreas ; Liu, Mingkai ; Lee, Bang Hyun ; Gu, Man Bock ; Kivshar, Yuri S ; Altug, Hatice
  • Subjects: Optics ; Physics ; SciAdv r-articles
  • Is Part Of: Science advances, 2019-05, Vol.5 (5), p.eaaw2871-eaaw2871
  • Description: Infrared spectroscopy resolves the structure of molecules by detecting their characteristic vibrational fingerprints. Subwavelength light confinement and nanophotonic enhancement have extended the scope of this technique for monolayer studies. However, current approaches still require complex spectroscopic equipment or tunable light sources. Here, we introduce a novel metasurface-based method for detecting molecular absorption fingerprints over a broad spectrum, which combines the device-level simplicity of state-of-the-art angle-scanning refractometric sensors with the chemical specificity of infrared spectroscopy. Specifically, we develop germanium-based high- metasurfaces capable of delivering a multitude of spectrally selective and surface-sensitive resonances between 1100 and 1800 cm . We use this approach to detect distinct absorption signatures of different interacting analytes including proteins, aptamers, and polylysine. In combination with broadband incoherent illumination and detection, our method correlates the total reflectance signal at each incidence angle with the strength of the molecular absorption, enabling spectrometer-less operation in a compact angle-scanning configuration ideally suited for field-deployable applications.
  • Publisher: United States: American Association for the Advancement of Science
  • Language: English
  • Identifier: ISSN: 2375-2548
    EISSN: 2375-2548
    DOI: 10.1126/sciadv.aaw2871
    PMID: 31123705
  • Source: PubMed Central
    DOAJ Directory of Open Access Journals
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