Beyond-limit light focusing in the intermediate zone

K. R. Chen, W. H. Chu, H. C. Fang, C. P. Liu, C. H. Huang, H. C. Chui, C. H. Chuang, Y. L. Lo, C. Y. Lin, H. H. Hwung, Andy Y.G. Fuh

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


We experimentally verify that a new nanolens of a designed plasmonic aperture can focus visible light to a single line with its width smaller than the limit of half the wavelength in the intermediate zone. The experimental measurement indicates that while the near field plays a role to increase the spot size in the near zone, it is negligible at the beyond-limit focused region; i.e., the focused light is dominated by the radiative fields. The image taken by the optical microscope shows that the fields focused have propagated to the far zone. Besides being of academic interest, the nanolens capable in achieving a lower diffraction limit in the intermediate zone is important for application possibilities.

Original languageEnglish
Pages (from-to)4497-4499
Number of pages3
JournalOptics Letters
Issue number23
Publication statusPublished - 2011 Dec 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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