The performances of a porous silicon nanorods / gold nanoparticle combination for high sensitivity plasmonic sensing was assessed. First, an innovative synthesis technique was developed in a view to obtain porous silicon particles (nanorods due to their elongated shape) with homogeneous size and shape. The porous silicon nanorods were then spin coated on a glass substrate covered with gold nanoparticles. The combination of the high specific surface area porous silicon nanorods and the plasmonic effect of the Au nanoparticles was tested to form a highly sensitive ellipsometric sensing device. The porous silicon nanorods could be attached to both the plane Au surface and the Au nanoparticles with a specific spectral shift in the reflected polarized light.
Materials in thin-film structures for optical sensing applications must have multiple features: (i) enhancing the optical signal providing high optical sensitivity for the measurement of the interface processes, (ii) having appropriate chemical properties for supporting the adsorption of the molecules to be detected, (iii) having stability and selectivity. Development of materials that meet all these requirements is an ever lasting process with a lot of opportunities. In this work we propose porous silicon nanoparticles for the detection of biomolecules in plasmonic and Bragg multilayer enhanced Kretschmann-Raether ellipsometry configurations.
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