Negative refraction and subwavelength focusing using photonic crystals

Ekmel Ozbay*, Kaan Guven, Ertugrul Cubukcu, Koray Aydin, B. Kamil Alici

*Corresponding author for this work

Research output: Contribution to journalShort surveypeer-review

6 Scopus citations


In this article, we present an experimental and numerical study of novel optical properties of two-dimensional dielectric photonic crystals (PCs) which exhibit negative refraction. We investigate two mechanisms which utilize the band structure of the PC to generate a negative effective index of refraction (neff < 0) and demonstrate the negative refraction experimentally. To the isotropic extend of neff, different PC slab structures are employed to focus the radiation of a point source. It is shown experimentally that the PC can generate an image of the source with subwavelength resolution in the vicinity of the PC interface. Using a different PC, one can also obtain a far field focusing. In the latter case, we explicitly show the flat lens behavior of the structure. These examples indicate that PC-based lenses can surpass limitations of conventional lenses and lead to novel optics applications.

Original languageEnglish (US)
Pages (from-to)1275-1291
Number of pages17
JournalModern Physics Letters B
Issue number25
StatePublished - Oct 30 2004


  • Left-handed material
  • Negative refraction
  • Photonic crystal

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

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