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(a) SEM image of a silver nanoslit array formed on a mesa-etched quartz substrate. (The minor mesas observed on some trench bottoms are irregularly etched quartz surface profiles.) (b) Transmission spectra of nanoslit arrays with Ag layer thickness of 120, 180, or .
(Color online). FDTD simulation of the field and energy flow distributions calculated at three different wavelengths, [(a) and (b)], [(c) and (d)], and [(d), and (e)]. A silver nanoslit array with a rectangular cross section is assumed with metal thickness, period, and slit width. A TM-polarized planar wave is incident from the air side (bottom) and exits to the quartz side (top).
(Color online). FDTD simulation of time evolution of the SP polarization charge distributions calculated at three different regimes, at (a), (b), and (c) wavelength. Four snapshot images of charge distributions are displayed with a phase interval. The red and blue colors along the periphery of each metal island represent the positive and negative polarity of charges, respectively.
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