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Schottky photodetectors are attractive for CMOS-compatible photonicintegrated circuits, but the trade-off between photon absorption and hotcarrier emission often compromises the detection fidelity and sensitivity.Here, we report a hybridization-based waveguiding effect that can improve thesensitivity of guided-wave Schottky detection by >200x. By hybridizing thesupermodes guided by asymmetrical coupled plasmonic nanostructures,light-matter-interaction can be significantly enhanced even if the thickness ofthe light absorbing region is only a few nanometers, thus allowing theabsorption and emission efficiencies to be simultaneously optimized for thefirst time. Using amorphous-based active junction with absorbing volume of only0.031 {\mu}m3, our detectors demonstrate record experimental sensitivity of -55dBm, approaching that of crystalline-based Ge counterparts with >36x largerabsorption region. The ability to maximize field overlap within small devicevolume and improve photodetection fidelity without using crystalline materialspave the way towards improved back-end-of-line interconnection, single photondetection, and 2D optoelectronics.

Supermode hybridization: a material-independent route towards record Schottky detection sensitivity using <0.05 {\mu}m3 amorphous absorber volume