Wideband slow short-pulse propagation in one-thousand slantingly coupled L3 photonic crystal nanocavities

Eiichi Kuramochi, Nobuyuki Matsuda, Kengo Nozaki, Anthony H.K. Park, Hiroki Takesue, Masaya Notomi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Coupled cavities have been used previously to realize on-chip low-dispersion slow-light waveguides, but the bandwidth was usually narrower than 10 nm and the total length was much shorter than 1 mm. Here we report long (0.05-2.5 mm) slow-light coupled cavity waveguides formed by using 50, 200, and 1,000 L3 photonic crystal nanocavities with an optical volume smaller than (λ/n)3, slanted from Γ-K orientation. We demonstrate experimentally the formation of a single-mode wideband coupled cavity mode with a bandwidth of up to 32nm (4THz) in telecom C-band, generated from the ultra-narrow-band (~300 MHz) fundamental mode of each L3 nanocavity, by controlling the cavity array orientation. Thanks to the ultrahigh-Q nanocavity design, coupled cavity waveguides longer than 1 mm exhibited low loss and allowed time-of-flight dispersion measurement over a bandwidth up to 22 nm by propagating a short pulse over 1,000 coupled L3 nanocavities. The highly-dense slanted array of L3 nanocavity demonstrated unprecedentedly high cavity coupling among the nanocavities. The scheme we describe provides controllable planar dispersion-managed waveguides as an alternative to W1-based waveguides on a photonic crystal chip.

Original languageEnglish
Pages (from-to)9552-9564
Number of pages13
JournalOptics Express
Issue number8
Publication statusPublished - 2018 Apr 16


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