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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 39,
  • Issue 9,
  • pp. 2888-2894
  • (2021)

All-Optical Hybrid VO $_{2}$ /Si Waveguide Absorption Switch at Telecommunication Wavelengths

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Abstract

Vanadium dioxide (VO $_{2}$ ) is one of the most promising materials for developing hybrid photonic integrated circuits (PICs). At telecommunication wavelengths, VO $_{2}$ exhibits a large change on the refractive index ( $\Delta n \sim 1$ and $\Delta \kappa \sim 2.5$ ) between its insulating and metallic state. Such insulating-to-metal transition (IMT) can be triggered by light, which could enable all-optical hybrid VO $_{2}$ -waveguide devices. Here, we experimentally demonstrate an all-optical absorption switch using a hybrid VO $_{2}$ /Si waveguide fully compatible with the silicon photonics platform. All-optical characterization was carried out for TE polarization and at telecommunication wavelengths using an in-plane approach. The temporal dynamics were retrieved by means of pump-probe measurements. Our results show an extinction ratio of 0.7 dB/ $\mu$ m with a maximum switchable length of 15 $\mu$ m, a switching speed as low as 318 ns, and an energy per switch of 15.8 nJ. The inherit large optical bandwith of a non-resonant waveguide poses this device as a promising candidate for developing all-optical and broadband silicon PICs.

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