We present coherent perfect absorbers based on topological guided-mode resonances at a topological junction of two thin-film waveguide lattices. The proposed structure provides a fully confined resonance state in both vertical and lateral dimensions, creating a compact coherent absorber possibly operating at the critical coupling condition for the complete annihilation of certain optimized coherent incoming waves. We provide a promising Si-photonic design, incoming wave configuration, and theoretical performance for its operation as a compact coherent absorber in the integrated optics platform.
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