Optically Monitored Electrical Switching in VO2

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• 作者：Petr Markov ; Robert E. Marvel ; Hiram J. Conley ; Kevin J. Miller ; Richard F. Haglund ; Jr. ; Sharon M. Weiss
• 刊名：ACS Photonics
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：2
• 期：8
• 页码：1175-1182
• 全文大小：564K
• ISSN：2330-4022

文摘

We demonstrate a hybrid silicon鈥搗anadium dioxide (Si-VO₂) electro-optic modulator that enables direct probing of both the electrically triggered semiconductor-to-metal phase transition in VO₂ and the reverse transition from metal to semiconductor. By using a two-terminal in-plane VO₂ electrical switch atop a single-mode silicon waveguide, the phase change can be initiated electrically and probed optically, separating the excitation and measurement processes and simplifying the analysis of the metal-to-semiconductor dynamics. We demonstrate a record switch-on time for high-speed electrical semiconductor-to-metal transition, with switching times less than 2 ns, and quantify the slower inverse transition, which is dominated by thermal dissipation and relaxation of the metallic rutile lattice to the monoclinic semiconducting phase. By limiting the current through the VO₂ to reduce Joule heating, we enable inverse relaxation times as fast as 3 ns.