Large-scale arrays of ultrahigh-Q coupled nanocavities

Masaya Notomi, Eiichi Kuramochi, Takasumi Tanabe

Research output: Contribution to journalArticlepeer-review

427 Citations (Scopus)


Coupled microresonators are expected to play a key role in slow-light engineering and various types of light-matter interaction enhancement, especially if they are based on small and high-Q cavities. Although rapid progress has been made on microresonator performance, large-scale arrays of coupled resonators based on high-Q wavelength-sized cavities have not yet been realized. Here, we show large-scale (N>100) ultrahigh-Q coupled nanocavity arrays based on photonic crystals. This is the first demonstration of large-scale coupled resonator arrays based on wavelength-sized cavities, in which tight-binding sinusoidal dispersion is seen. We confirm that an ultrahigh value of Q (∼1×106) is maintained, even when N is large, and the resonators exhibit very low loss characteristics with regard to light propagation. The ultrahigh value of Q and small size has enabled us to achieve ultraslow light pulse propagation with a group velocity well below 0.01c and a long group delay.

Original languageEnglish
Pages (from-to)741-747
Number of pages7
JournalNature Photonics
Issue number12
Publication statusPublished - 2008 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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