Systematic design of flat band slow light in photonic crystal waveguides.
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.
School of Physics and Astronomy, University of St Andrews, St Andrews, Fife, KY16 9SS, UK.
Juntao
J
Li
Thomas P
TP
White
Liam
L
O'Faolain
Alvaro
A
Gomez-Iglesias
Thomas F
TF
Krauss
D003461:Crystallography; D008027:Light; D008855:Microscopy, Electron, Scanning; D017785:Photons; D013057:Spectrum Analysis