title: Color matrix refractive index sensors using coupled vertical silicon nanowire arrays.
abstract: Vivid colors are demonstrated in silicon nanowires with diameters ranging from 105 to 346 nm. The nanowires are vertically arranged in a square lattice with a pitch of 400 nm and are electromagnetically coupled to each other, resulting in frequency-dependent reflection spectra. Since the coupling is dependent on the refractive index of the medium surrounding the nanowires, the arrays can be used for sensing. A simple sensor is demonstrated by observing the change in the reflected color with changing refractive index of the surrounding medium. A refractive index resolution of 5 × 10(-5) is achieved by analyzing bright-field images captured with an optical microscope equipped with a charge coupled device camera.
authors: Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
authors: M
authors: M
authors: Khorasaninejad
authors: N
authors: N
authors: Abedzadeh
authors: J
authors: J
authors: Walia
authors: S
authors: S
authors: Patchett
authors: S S
authors: SS
authors: Saini