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Imaging-based molecular barcoding with pixelated dielectric metasurfaces

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Science  08 Jun 2018:
Vol. 360, Issue 6393, pp. 1105-1109
DOI: 10.1126/science.aas9768

Metasurfaces for molecular detection

Although mid-infrared (mid-IR) spectroscopy is a mainstay of molecular fingerprinting, its sensitivity is diminished somewhat when looking at small volumes of sample. Nanophotonics provides a platform to enhance the detection capability. Tittl et al. built a mid-IR nanophotonic sensor based on reflection from an all-dielectric metasurface array of specially designed scattering elements. The scattering elements could be tuned via geometry across a broad range of wavelengths in the mid-IR. The approach successfully detected and differentiated the absorption fingerprints of various molecules. The technique offers the prospect of on-chip molecular fingerprinting without the need for spectrometry, frequency scanning, or moving mechanical parts.

Science, this issue p. 1105