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The morphology and hole diameter analysis of Au nanohole arrays etched at different time: (a) 10 s; (b) 15 s; and (c) 20 s.
X-ray diffraction spectrum of pure Au film and nanohole arrays film with 15 s etching. Inset is the photography of large-scale gold nanohole arrays.
Optical transmission spectrum of the nanohole arrays with different hole diameters and hole depth.
Sequence of transmission spectra through the 15 s etched nanohole arrays as the refractive index increases from 1 to 1.44. Inset is the transmission spectra of pure gold film at the same conditions.
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