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

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

2011-02-10

arxiv.org/abs/1102.2140v3

Optics Express, Vol. 19, Issue 8, pp. 7244-7261 (2011)

Physics

Optics

18 pages, 8 figures, accepted by Optics Express

Scientific paper

10.1364/OE.19.007244

We investigate the interaction of highly focused linearly polarized optical beams with a metal knife-edge both theoretically and experimentally. A high numerical aperture objective focusses beams of various wavelengths onto samples of different sub-wavelength thicknesses made of several opaque and pure materials. The standard evaluation of the experimental data shows material and sample dependent spatial shifts of the reconstructed intensity distribution, where the orientation of the electric field with respect to the edge plays an important role. A deeper understanding of the interaction between the knife-edge and the incoming highly focused beam is gained in our theoretical model by considering eigenmodes of the metal-insulator-metal structure. We achieve good qualitative agreement of our numerical simulations with the experimental findings.

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