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. 2017 Mar 27;12:2307–2314. doi: 10.2147/IJN.S128172

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© 2017 Zhang et al. This work is published and licensed by Dove Medical Press Limited

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(A) The angular SPR reflectivity (black square) and fluorescence spectra of Au nanohole array for the sandwich assay of PSA at concentrations of (1) 0, (2) 300 fM, (3) 3 pM, (4) 30 pM, (5) 300 pM, and (6) 3 nM. (B) Calibration curves for PSA detection based on Au nanohole with (1) coexcited LSP and PSP modes and (2) LSP mode. Error bars were obtained from the measurements on three different chips.

Abbreviations: SPR, surface plasmon resonance; PSA, prostate-specific antigen; LSP, localized surface plasmon; PSP, propagating surface plasmon.