Near-field focusing with optical phase antennas

A.G. Curto, A. Manjavacas, F.J. García de Abajo

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

We investigate the near-field focusing properties of three- dimensional phase antennas consisting of concentric rings designed to have source and image spots separated by several microns from the lens. Tight focal spots are obtained for silicon or gold rings patterned in a silica matrix. We analyze in detail the dependence of the performance of these lenses on geometrical parameters such as the number of rings, the ring thickness, and the focal distance. Subwavelength focal spots are found to form at distances of tens of wavelengths from the lens, thus suggesting applications to remote sensing and penlight microscopy and lithography.

Original languageEnglish
Pages (from-to)17801-17811
Number of pages11
JournalOptics Express
Volume17
Issue number20
DOIs
Publication statusPublished - 28 Sep 2009
Externally publishedYes

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