Superprism phenomena in photonic crystals: Toward microscale lightwave circuits

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

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)


The superprism phenomenon, the dispersion of light 500 times stronger than the dispersion in conventional prisms, was demonstrated at optical wavelengths in photonic crystals (PC's) fabricated on Si. Drastic light-beam steering in the PC's was achieved by slightly changing the incident wavelength or angle. The scanning span reached 50° with only a 1% shift of incident wavelength, and reached 140° with only a 14° shift of the incident angle at wavelengths around 1 μm. The propagation direction was quantitatively interpreted in terms of highly anisotropic dispersion surfaces derived by photonic-band calculation. The physics behind this demonstration will open a novel field called photonic crystalline optics. The application of these phenomena promises to enable the fabrication of integrated microscale lightwave circuits (μLC's) on Si with large scale integrated (LSI)-compatible lithography techniques. Such μLC's will allow more efficient use of wavelength resources when used in wavelength multiplexers/demultiplexers or dispersion compensators by enabling lower loss and broader bandwidth.

Original languageEnglish
Pages (from-to)2032-2038
Number of pages7
JournalJournal of Lightwave Technology
Issue number11
Publication statusPublished - 1999 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Superprism phenomena in photonic crystals: Toward microscale lightwave circuits'. Together they form a unique fingerprint.

Cite this