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We experimentally demonstrate broadband waveguide crossing arrays showingultra low loss down to $0.04\,$dB/crossing ($0.9\%$), matching theory, andcrosstalk suppression over $35\,$dB, in a CMOS-compatible geometry. Theprinciple of operation is the tailored excitation of a low-loss spatial Blochwave formed by matching the periodicity of the crossing array to the differencein propagation constants of the 1$^\text{st}$- and 3$^\text{rd}$-order TE-likemodes of a multimode silicon waveguide. Radiative scattering at the crossingpoints acts like a periodic imaginary-permittivity perturbation that couplestwo supermodes, which results in imaginary (radiative) propagation-constantsplitting and gives rise to a low-loss, unidirectional breathing Bloch wave.This type of crossing array provides a robust implementation of a key componentenabling dense photonic integration.

Ultra-low-loss CMOS-Compatible Waveguide Crossing Arrays Based on Multimode Bloch Waves and Imaginary Coupling