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In this paper we suggest and theoretically study a tapered plasmonicnanostructure which connects the incident wave beam with a subwavelengthspatial region where the field is locally enhanced in a broad frequency rangeor for different operation frequencies. This spatial region has a frequencystable location near the contour of the tapered structure. This results from aspecial waveguide mode which can also exist in the tapered structure. Weforesee many possible applications for our structure from prospectivenear-field scanning optical microscopes to interconnects between conventionaloptical waveguides and prospective optical nanocircuits.

Nanostructures for very broadband or multi-frequency transition from wave beams to a subwavelength light distributions