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2 October 2007 Comparisons of the surface plasmon sensitivities for nanohole and nanoslit arrays
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Three kinds of periodic gold nanostructures: nanoslit array, nanohole array and nanogrid, were fabricated and compared. These nanostructures were made on a 130nm-thick gold film with the same 600nm-period. Each array size was 150μm x 150μm in square. The transmission spectra show 630nm peak in air and about 830nm peak in water environment. These peaks are verified by the resonances of surface plasmonic waves on the outside surface. The wavelength sensitivities of the surface plasmon resonance in aqueous condition are tested. They are 590.9nm, 556nm and 514nm per refractive index change for the nanoslit, nanogrid and nanohole structures, respectively. The higher sensitivity of nanoslit array is attributed to the extraordinary transmission of transverse magnetic wave in the nanoslit gap.
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Kun-Li Lee, Chia-Wei Lee, and Pei-Kuen Wei "Comparisons of the surface plasmon sensitivities for nanohole and nanoslit arrays", Proc. SPIE 6641, Plasmonics: Metallic Nanostructures and Their Optical Properties V, 66411N (2 October 2007); doi: 10.1117/12.731195;

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