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(a) Measured optical transmission spectra of the template-stripped nanohole array in a 200 nm-thick Au film (hole diameter: 200 nm, periodicity: 500 nm) in index-calibrated water-glycerol solutions. The refractive index (RI) of the solution increases from 1.333 to 1.361. (b) As the RI increases, the transmission minimum around 710 nm shifts towards longer wavelengths. The measured bulk refractive index sensitivity is 481 nm/RIU.
