Fig. 2. Plasmonic nanohole array on the surface of Scotch tape.

a Photographs showing the PDMS donor substrate coated with an Au film (left), the same substrate after the Au film is stripped (middle), and the nanohole film transferred to the surface of the tape (left). Scale bars represent 2 cm. b, c SEM images of the stripped single-layer Au nanohole array on the tape surface. d Measured reflection spectra for the transferred single-layer gold nanohole array (period: P = 600 nm) arranged in square (hole diameter: d = 275 nm) and hexagonal (d = 240 nm) patterns. D₁ and D₂ in d show the reflection dips for the square and hexagonal spaced arrays, respectively, associated with the excitation of (1,0) order SPP at the air–Au and tape–Au interfaces