Fig. 3 Angle-multiplexed molecular fingerprint detection.

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Fig. 3 Angle-multiplexed molecular fingerprint detection. Angle-multiplexed molecular fingerprint detection. (A) Photograph of a fabricated large-area all-dielectric metasurface used for reflection experiments. (B and C) Scanning electron microscopy micrographs of the metasurface confirm the homogeneity of the nanofabrication. (D) Normalized reflectance spectra of the metasurface before analyte coating. The angular range is from θ = 13° to θ = 60°, which corresponds to a wide spectral tuning range of 1120 to 1800 cm−1. (E) Normalized reflectance spectra after deposition of a spin-coated PMMA thin film. Multiple molecular absorption bands of the PMMA are clearly visible as a distinct modulation of the reflectance spectra. (F) Absorbance spectrum in optical density (OD) units calculated from the reflectance envelopes before and after analyte coating. Agreement with independent IRRAS measurements is excellent, and a signal enhancement factor of around 50 is observed. Aleksandrs Leitis et al. Sci Adv 2019;5:eaaw2871 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).