Quantitative Analysis of Bending Efficiency in Photonic-Crystal Waveguide Bends at x=1.55{micro}m Wavelengths

Based on a photonic-crystal slab structure, a 60° photonic-crystal waveguide bend is successfully fabricated. Its bending efficiency within the photonic bandgap is measured, and near 100% efficiency is observed at certain frequencies near the valence band edge. The bending radius is ∼1 μm at a wavelength of λ∼1.55 μm. The measured η spectrum also agrees well with a finite-difference time-domain simulation.

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