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Abstract
With operating frequency f=1thz, two-dimensional (2D) graded eye-shape scatterers were firstly applied into photonic crystal waveguide (PCW) for slow light effect in two ways: (1) selecting group index ng from 31.4 to 95.0, low-dispersion bandwidth (ng varies within a 10% range) was got from 0.736μm to 2.334μm, and ultralow-dispersion bandwidth (ng varies within a 1% range) was got from 0.438μm to 0.945μm by grading the eye-shape scatterers along the longitudinal direction; (2) selecting group index ng from 32.1 to 98.3, low-dispersion bandwidth was got from 0.559μm to 1.765μm, and ultralow-dispersion bandwidth was got from 0.296μm to 0.661μm by grading the eye-shape scatterers along the transverse direction. The 2D graded structures can also used in asymmetrical structures and heterostructures for slow light effect.
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