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Microscopic pyramidal pits in a reflective surface, a geometry similar to aretroreflector, are frequently used to enhance signal strength. The enhancementeffect is generally attributed to surface plasmons, however, the sub-wavelengthto near-wavelength dimensions of the pyramidal 3D geometry suggestcontributions from diffraction and near-field effects. Our theoretical analysisof the light intensity distribution in the similar (but simpler) 2D geometryassuming a perfect conductor screen, that is, in the absence of any plasmoneffects, shows that interference patterns forming within the cavity cause asignificant resonant increase in local intensity. Such effect can be importantfor many applications, especially for the widely used Raman spectroscopy.Resonant enhancement without plasmons of the emitted Raman signal due toenhanced local field amplitude is also possible, which implies that thegeometry practically implements a Raman laser. Comparison of diffractionpatterns obtained with near-field and far-field approaches reveals that thenear-field component is responsible for the observed dramatic intensityenhancement, and thus the Raman enhancement as well.

Resonance enhancement effects in Raman-enhancing pyramid-like V-shape groove microstructures