Photothermal optical modulation of ultra-compact hybrid Si-VO₂ ring resonators

We demonstrate photothermally induced optical switching of ultra-compact hybrid Si-VO₂ ring resonators. The devices consist of a sub-micron length ~70 nm thick patch of phase-changing VO₂ integrated onto silicon ring resonators as small as 1.5 μm in radius. The semiconductor-to-metal transition (SMT...

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Bibliographic Details
Published in:Optics express 2012-06, Vol.20 (12), p.13215-13225
Main Authors: Ryckman, Judson D, Diez-Blanco, V, Nag, Joyeeta, Marvel, Robert E, Choi, B K, Haglund, Richard F, Weiss, Sharon M
Format: Article
Language:English
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Summary:We demonstrate photothermally induced optical switching of ultra-compact hybrid Si-VO₂ ring resonators. The devices consist of a sub-micron length ~70 nm thick patch of phase-changing VO₂ integrated onto silicon ring resonators as small as 1.5 μm in radius. The semiconductor-to-metal transition (SMT) of VO₂ is triggered using a 532 nm pump laser, while optical transmission is probed using a tunable cw laser near 1550 nm. We observe optical modulation greater than 10dB from modest quality-factor (~10³) resonances, as well as a large -1.26 nm change in resonant wavelength Δλ, resulting from the large change in the dielectric function of VO₂ in the insulator-to-metal transition achieved by optical pumping.
ISSN:1094-4087
DOI:10.1364/OE.20.013215