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We investigate the interaction of highly focused linearly polarized opticalbeams with a metal knife-edge both theoretically and experimentally. A highnumerical aperture objective focusses beams of various wavelengths onto samplesof different sub-wavelength thicknesses made of several opaque and purematerials. The standard evaluation of the experimental data shows material andsample dependent spatial shifts of the reconstructed intensity distribution,where the orientation of the electric field with respect to the edge plays animportant role. A deeper understanding of the interaction between theknife-edge and the incoming highly focused beam is gained in our theoreticalmodel by considering eigenmodes of the metal-insulator-metal structure. Weachieve good qualitative agreement of our numerical simulations with theexperimental findings.

Interaction of highly focused vector beams with a metal knife-edge