Three-dimensional composite metallodielectric nanostructure for enhanced surface plasmon resonance sensing

Nanomushrooms

A mushroomlike composite metallodielectric nanostructure is shown to have improved characteristics for surface plasmon resonance (SPR) biosensing applications compared to conventional nanohole structure. SPR sensor detects change in the refractive index of its surface due to biomolecular binding by monitoring either the shift in resonant wavelength, angle, or intensity . Having a higher normal electrical field (as in this case) would result in a more sensitive sensor. An easy and repeatable fabrication method is given to give controllable linewidth by a straight-forward oblique metal deposition process. A sensor built with the composite nanostructure was then used to determine the hydrophilicity of its surface by monitoring the resonant wavelength shift and computing the corresponding adsorption thickness.

Nanomushrooms

Reference