Large-scale fabrication of plasmonic gold nanohole arrays for refractive index sensing at visible region

摘要

We present the design and fabrication of large-scale gold nanohole arrays based on the versatile nanosphere lithography technique. The gold nanohole arrays exhibit two surface plasmonic resonance related transmission peaks and show a sensitive response to refractive index. The working wavelength and sensitivity can be tuned by changing the hole diameter and hole depth. A sensitivity of 125nm/refractive index unit is obtained in the visible region. Our quasi-infinite gold nanohole arrays film can serve as an optical enhancing component while also can serve as a transparent conductive electrode for the opto-electric devices.