In the continuous pursuit of enhancing the sensitivity of nanophotonic biosensors by leveraging phase phenomena
a recent development involved the engineering of an atomically thin Ge
2
Sb
2
Te
5
layer on a silver nanofilm to generate large Goos–Hänchen-shifts associated with phase singularities. The resulting detection limit reached ~7 × 10
−7
RIU.
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references
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