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With a rapidly growing amount of data generated and processed, a search formore efficient components and architectures such as neuromorphic computing thatare able to perform a more and more complex operations in more efficient waycontinue. Here we show that thin films of chalcogenide phase change materials(semiconductors) can serve as building blocks for novel type of plasmoniccomponents that operate seamlessly in both electrical and optical domainswithout the need for repeated electrical-to-optical conversions. Inconsequence, novel waveguide-integrated devices were proposed that are able tooperate simultaneously as photodetectors and activation function units and thatare based on low-loss plasmonic waveguide platform and phase change materials.Theoretically predicted coupling efficiency exceeding 95 % and extremally lowinsertion losses of 0.01 dB/um in connection with an enhanced light-matterinteraction provided by plasmonics enables a realization of very efficient andcompact photodetectors and activation function units. A detection and thresholdmechanism involve a Joule heating of phase change materials through internal orexternal metal contacts. With this paper, different arrangements and operationconditions were analyzed to ensure most efficient on-chip signal processing.

Waveguide-integrated plasmonic photodetectors and activation function units with phase change materials