Systematic design of flat band slow light in photonic crystal waveguides

Juntao Li, Tom P White, Liam O'Faolain, Alvaro Gomez Iglesias, Thomas Fraser Krauss

Research output: Contribution to journalArticlepeer-review

516 Citations (Scopus)


We present a systematic procedure for designing "flat bands" of photonic crystal waveguides for slow light propagation. The procedure aims to maximize the group index - bandwidth product by changing the position of the first two rows of holes of W1 line defect photonic crystal waveguides. A nearly constant group index - bandwidth product is achieved for group indices of 30-90 and as an example, we experimentally demonstrate flat band slow light with nearly constant group indices of 32.5, 44 and 49 over 14 nm, 11 nm and 9.5 nm bandwidth around 1550 nm, respectively. (c) 2008 Optical Society of America.

Original languageEnglish
Pages (from-to)6227-6232
Number of pages6
JournalOptics Express
Issue number9
Publication statusPublished - 28 Apr 2008




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