Figure 5.

Spatially encoded spectral interrogation with multi-resonance nanophotonic sensors. (a) (left) Chirped guided-mode resonant grating where spectral resonance position is encoded in Y-axis as shown in the resonance map. (middle) Bright-field image of the grading and its corresponding intensity profile when illuminated with monochromatic light. (right) Temporal resonance position plot in an in-flow bioassay. Adapted with permission from [76]. © 2017 Optical Society of America; (b) barcode-based sensing encoding the high-Q resonance positions of dielectric metasurfaces into 2D multiresonance sensors. (Left to right) Monochromatic intensity images of a multiresonance sensor in the presence of different top-media, their corresponding sensing barcodes, index decoder, decoded barcodes and the spectra showing the resonance shifts in accordance with the top media refractive index. Adapted with permission from [29]. Copyright 2019 Nature Publishing Group.