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Geometric depiction of four unit cells of the gold nanocross square array on a silica substrate.
Top (a) and side (b) views of the simulated electric field magnitude (color) and electric current density inside the metal (arrows) for the designed nanocrosses at their resonance frequency, excited with normal incident light whose electric field is polarized along the -direction. Both views use a logarithmic scale in the field magnitude.
Top: numerical simulations of the transmittivity spectra of the gold nanocrosses array for different surrounding medium indices varying from to . Middle: associated sensitivity of the resonance frequency to index changes. Bottom: associated FOM.
SEM image of the fabricated sample.
Simulated transmission spectra (black line) and measured IR transmission spectra (gray line).
Measured IR transmission spectra before (black) and after functionalization of the gold surface (darker gray) and after sensing of ethylenediamine (lighter gray).
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