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Vanadium dioxide (VO2) is one of the most promising materials for developinghybrid photonic integrated devices (PICs). However, despite switching times aslow as a few femtoseconds have been reported, the all-optical temporal dynamicsof VO2 embedded in a waveguide using an in-plane optical signal remain stillhidden. Here, we experimentally investigate this behavior in hybrid VO2/Siwaveguides by using pump-probe measurements at telecom wavelengths. Our resultsshow switching times in the micro and nanosecond range, suggesting that thephase transition is triggered thermally from the light absorbed by the VO2 andthe temporal response is governed by thermal conductive dynamics. By properlyengineering the optical pulse, we prospect switching times of nanoseconds withan energy consumption of a few nanojoules. Our results unveil a new temporaldynamic that would be useful for developing future all-optical VO2 photonicintegrated devices.

Temporal dynamics of all-optical switching in hybrid VO2/Si waveguides