Observation of negative refraction and focusing in two-dimensional photonic crystals

Ekrael Ozbay, Man Bulu, Kaan Guven, Humeyra Caglayan, Koray Aydin

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)


We experimentally and theoretically demonstrate the negative refraction and focusing of electromagnetic (EM) waves by twodimensional photonic crystal slabs at microwave frequencies. The negative refraction is observed both for transverse magnetic (TM) and transverse electric (TE) polarized incident EM waves. Gaussian beam shifting method is used to verify the negative refractive index. The Subwavelength imaging and flat lens behavior of photonic crystals are succesfully demonstrated. We have been able to overcome the diffraction limit and focus the EM waves to a spot size of 0.21λ. Metallodielectric photonic crystals are employed to increase the range of angle of incidence that results in negative refraction. Experimental results and theoretical calculations are in good agreement throughout the work.

Original languageEnglish
Pages (from-to)6064-6070
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number8 A
Publication statusPublished - 4 Aug 2006
Externally publishedYes
Publication typeA1 Journal article-refereed


  • Band diagram
  • Equal frequency contours
  • Flat lens
  • Left-handed materials
  • Metamaterial
  • Negative refraction
  • Photonic band gap
  • Photonic crystals
  • Subwavelength imaging

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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