Self-collimating phenomena in photonic crystals

Hideo Kosaka, Takayuki Kawashima, Akihisa Tomita, Masaya Notomi, Toshiaki Tamamura, Takashi Sato, Shojiro Kawakami

Research output: Contribution to journalArticlepeer-review

747 Citations (Scopus)


We found that self-determining collimated light is generated in a photonic crystal fabricated on silicon. The divergence of the collimated beam is insensitive to that of the incident beam and much smaller than the divergence that would be generated in conventional Gaussian optics. The incident-angle dependence of the self-collimated light propagation including lens-like divergent propagation was interpreted in terms of the highly modulated dispersion surfaces with inflection points, where the curvature changes from downward to upward corresponding to respectively a concave/convex-lens case. This demonstration is an important step towards controlling beam profile in photonic crystal integrated light circuits and towards developing "photonic crystalline optics."

Original languageEnglish
Pages (from-to)1212-1214
Number of pages3
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 1999 Mar 1

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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