Degenerate band edges in optical fiber with multiple grating: efficient coupling to slow light
Degenerate band edges (DBEs) of a photonic bandgap have the form (ω − ωD) ∝ k2m for integers m > 1, with ωD the frequency at the band edge. We show theoretically that DBEs lead to efficient coupling into slow-light modes without a transition region, and that the field strength in the slow mode can far exceed that in the incoming medium. A method is proposed to create a DBE of arbitrary order m by coupling m optical modes with multiple superimposed gratings. The enhanced coupling near a DBE...[Show more]
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