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Transmission coefficient of the optical grating. Inset: schematic geometric grating structure. Plasmon modes are labeled, “a-m” and “m-s” denote air-metal and metal-semiconductor interfaces. From low to high transmission curves: , 1200, and 1600 nm. The curve at about 0.7 denotes the case without any metal film.
Temporal developments and spatial distributions of (a) and (b) . Inset in (a) shows in the absence of a metal film in which case the field is always zero.
Time integrated distributions of (a) and (b) in the semiconductor. Note that the and is zero in the no-film case. The ordering of the curves is the same as that in Fig. 1.
Photocurrent density spectra of the five grating structures under investigation. Red dashed lines correspond to the no-film case, . (a) ; (b) ; and (c) with excluded, showing that the contribution is large.
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