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SEM images of the nanoslit-cavity with length of and size of 15 nm in plane view (a) and in cross section (b).
Raman spectra of nanoslit-cavity samples with Si substrate (i) and without the Si substrate (II) below the nanoslit, and a reference Raman spectrum from a flat Au surface.
Polarization dependence of nanoslit-cavity samples with different size. (a) Raman spectra from a small nanoslit with a width of 15 nm and (b) from a large slit with a width of 500 nm (c). The black arrows perpendicular to the nanoslit correspond to the polarization angle at 0°, while the pink arrows parallel to the nanoslit correspond to the polarization angle at 90°.
FDTD calculated profiles of the optical field in the samples (a) with the Si substrate and (b) without the Si substrate below the nanoslits.
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