This talk highlights advances in fabrication and performance of ultrafast switching of the nanoscale VO2 thin-film modulator. Studies of ultrafast excitation and relaxation of VO2 confirm the existence of an excited monoclinic phase (mM) with a fast recovery time compatible with Tbps switching. We show how nanoscale modulator design, and particularly optimizing the resonant ring, can achieve power requirements compatible with systems specifications for all-optical modulators, and elaborate on the effects of dopants. Finally, we show how optical switching in the hybrid ring resonator can be achieved using near band-edge pumping of the VO2 nanopatch at wavelengths in the telecommunications band.
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