Beyond-limit light focusing in the intermediate zone

Details Beyond-limit light focusing in the intermediate zone Beyond-limit light focusing in the intermediate zone

2009-01-13

arxiv.org/abs/0901.1731v1

Physics

Optics

16 pages, 4 figures

Scientific paper

We experimentally demonstrate that a new nanolens of designed plasmonic subwavelength aperture can focus light to a single-line with its width beyond the diffraction limit that sets the smallest achievable line width at half the wavelength. The measurements indicate that the effect of the near-field on the light focused is negligible in the intermediate zone of 2 < kr < 4 where the line-width is smaller than the limit. Thus, as a verification of theoretical prediction, the fields focused are radiative and with a momentum capable of propagating to the far zone as concerned by the limit.

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