Abstract
We demonstrate a concept for tailoring the group velocity and dispersion properties for light propagating in a planar photonic crystal waveguide. By perturbing the holes adjacent to the waveguide core it is possible to increase the useful bandwidth below the light-line and obtain a photonic crystal waveguide with either vanishing, positive, or negative group velocity dispersion and semi-slow light. We realize experimentally a silicon-on-insulator photonic crystal waveguide having nearly constant group velocity ~c(0)/34 in an 11-nm bandwidth below the silica-line.
Highlights
The intricate confinement of light in a photonic crystal waveguide (PhCW) [1] and its resulting dispersion properties offer sophisticated possibilities for realizing complex nanophotonic circuits
It has been demonstrated that the dispersion properties of PhCWs can be altered via a structural tuning of the waveguide geometry, typically, by changing the waveguide width or by introducing bi-periodicity [11, 12, 13]
Such dramatic changes of the PhCW may lead to multimode operation, decreased coupling efficiency to a photonic wire, and structural continuity problems in, e.g., bend and splitting regions
Summary
The intricate confinement of light in a photonic crystal waveguide (PhCW) [1] and its resulting dispersion properties offer sophisticated possibilities for realizing complex nanophotonic circuits. It has been demonstrated that the dispersion properties of PhCWs can be altered via a structural tuning of the waveguide geometry, typically, by changing the waveguide width or by introducing bi-periodicity [11, 12, 13]. We show how the knowledge of the field distributions in a single-line defect (W1) PhCW can be exploited to tailor the dispersion properties of the fundamental even photonic bandgap (PBG) mode. In this way, one can realize a silicon-on-insulator (SOI) W1 PhCW with semi-slow light having a group velocity in the range ~(c0/15 – c0/100); vanishing, positive, or negative group velocity dispersion (GVD); and low-loss propagation in a practical ~5-15 nm bandwidth
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