Photonic Integrated Circuits Using Electrochromism

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This project investigates the combination of established photonic integrated circuits with materials showing an opto-ionic function which is commonly termed as electrochromism. We propose actuation by optical phase shift in on-chip waveguides by changing the charge-state of the mixed ionic-electronic conductors. Suitable conductor-claddings should be introduced into the established lines of microfabrication, enabling a novel generation of chip integrated, solid-state trimming and switching devices for different wavelength regimes. The goal of the project is the experimental demonstration of the controlled light-modulation in silicon-nitride and silicon waveguides by applying tailored active claddings of mixed ionic-electronic conductors. We target to achieve a compact (10 μm) trimming device with short latency that works with low electrical energy (< 1 nJ) and is activated by low control voltages (< 5 V). The project will be performed as a joint effort of an engineering team expertized in silicon photonics and a materials research team specialized in thin-film battery materials.