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

Aleksandrs Leitis, Andreas Tittl, Mingkai Liu, Bang Hyun Lee, Man Bock Gu, Yuri S. Kivshar, Hatice Altug

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

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-Q metasurfaces capable of delivering a multitude of spectrally selective and surface-sensitive resonances between 1100 and 1800 cm −1 . 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.

Original languageEnglish
Article numbereaaw2871
JournalScience Advances
Volume5
Issue number5
DOIs
Publication statusPublished - 2019 May 17

ASJC Scopus subject areas

  • General
  • Physics and Astronomy (miscellaneous)

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