Abstract
We have systematically investigated the wideband slow light in two-dimensional material graphene, revealing that graphene exhibits much larger slow light capability than other materials. The slow light performances including material dispersion, bandwidth, dynamic control ability, delay-bandwidth product, propagation loss, and group-velocity dispersion are studied, proving graphene exhibits significant advantages in these performances. A large delay-bandwidth product has been obtained in a simple yet functional grating waveguide with slow down factor c/vg at 163 and slow light bandwidth Δω at 94.4 nm centered at 10.38 μm, which is several orders of magnitude larger than previous results. Physical explanation of the enhanced slow light in graphene is given. Our results indicate graphene is an excellent platform for slow light applications, promoting various future slow light devices based on graphene.
Highlights
We have systematically investigated the wideband slow light in two-dimensional material graphene, revealing that graphene exhibits much larger slow light capability than other materials
A largely improved delay-bandwidth product has been obtained after optimizations with S factor of 163 and slow light bandwidth Δ ω of 94.4 nm, which is rarely seen in other materials
One significant feature is that a large flat region is observed in the middle of the S factor curve, which is apparently different with previous slow light publications in graphene[5,8,18]
Summary
We have systematically investigated the wideband slow light in two-dimensional material graphene, revealing that graphene exhibits much larger slow light capability than other materials. A largely improved delay-bandwidth product has been obtained after optimizations with S factor of 163 and slow light bandwidth Δ ω of 94.4 nm, which is rarely seen in other materials. One significant feature is that a large flat region is observed in the middle of the S factor curve, which is apparently different with previous slow light publications in graphene[5,8,18].
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