Subwavelength focusing using a hyperbolic medium with a single slit

Guixin LI*, Jensen Li, Kok Wai CHEAH

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

17 Citations (Scopus)


A hyperbolic dispersion medium with a planar surface that can be used for subwavelength focusing is proposed. By combining the hyperbolic medium in a single slit with diffraction limit width, a laser beam could be focused to a subwavelength spot in the near field. Compared to a conventional superlens, the subdiffraction focusing in this work has higher optical throughput. Using a planar hyperbolic medium, which is actually alternating silver/dielectric multilayers, we showed that the focusing resolution of the designed device is down to ∼λ=5 using green light illumination (at a wavelength of 514.5nm).

Original languageEnglish
Pages (from-to)G27-G30
Number of pages4
JournalApplied Optics
Issue number31
Publication statusPublished - 1 Nov 2011

Scopus Subject Areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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