Abstract
A 2D optical virtual probe based on surface plasmon polaritons (SPP) in a band- gap structure with a rectangular proflle is proposed and investigated numerically by means of flnite difierence time domain (FDTD) method. The dependence of the distributions of the con- flned optical flelds on difierent structure parameters is numerically analyzed. The results indicate that with the proper structure design, the full width at half maximal (FWHM) of the conflned beam can keep constant in a certain distance range, and the fleld intensity of the conflned vir- tual probe can be enhanced greatly by SPP. Compared with the optical virtual probe based on interference of evanescent waves, this type of virtual probe has merits of high intensity and high sensitivity, and is likely to promise for the applications in nano-photonics devices based on SPP. DOI: 10.2529/PIERS060903234639
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