Beam steering in planar-photonic crystals: From superprism to supercollimator

L J Wu, M Mazilu, T F Krauss

Research output: Contribution to journalArticlepeer-review

186 Citations (Scopus)


We utilize the anomalous dispersion of planar-photonic crystals (PhCs) near the dielectric band edge to control the wavelength-dependent propagation of light. Light beams with up to 20degrees divergence were collimated over a 25-nm (1285 nm to 1310 nm) bandwidth using a triangular lattice. The "super-prism" phenomenon is demonstrated in the same configuration, simply by tuning the wavelength. Sources of loss are discussed. Both the plane-wave expansion calculation and finite-difference time-domain simulation match well with the experimental results. This is the first experimental demonstration of self-collimating phenomena in a PhC configuration.

Original languageEnglish
Pages (from-to)561-566
Number of pages6
JournalIEEE Journal of Lightwave Technology
Issue number2
Publication statusPublished - Feb 2003


  • angular dispersion
  • loss
  • planar-photonic crystals
  • self-collimating phenomena


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