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arXiv 1306.0292cond-mat.mtrl-sci
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VO2 RF器件的电开关动力学和宽带微波特性

Electrical switching dynamics and broadband microwave characteristics of VO2 RF devices

Sieu D. Ha, You Zhou, Christopher J. Fisher, Shriram Ramanathan, Jacob P. Treadway

摘要:

二氧化钒是一种相关电子系统,其特征在于高于室温的金属-绝缘体相变(MIT),并且在高速开关器件中是令人感兴趣的。在这里,我们将VO 2集成到两端共面波导中,并在电(即通过偏置电压,称为E-MIT)和热(T-MIT)驱动转变中展示了相同幅度(>10^3)的大电阻调制。我们研究瞬态开关特性的E-MIT和观察两个可区分的时间尺度切换。我们发现电导率的突然跳跃,上升时间为10 ns的数量级,随后是几μs数量级的振荡阻尼到稳态。我们的RF功率响应的特征在于在ON状态,并发现高RF输入功率驱动VO 2进一步进入金属相,表明电磁辐射切换的相变可能是可能的。我们测量的S参数RF性能高达13.5 GHz。插入损耗在导通状态下在整个频率范围内明显平坦,为2.95 dB,在关断状态下观察到超过25 dB的充分隔离。我们能够使用集总元件和3D电磁模型准确地模拟RF响应。外推我们的结果表明,优化器件的几何形状可以进一步降低插入损耗,并保持宽带平坦度高达40 GHz。

英文摘要:

Vanadium dioxide is a correlated electron system that features a metal-insulator phase transition (MIT) above room temperature and is of interest in high speed switching devices. Here, we integrate VO2 into two-terminal coplanar waveguides and demonstrate a large resistance modulation of the same magnitude (>10^3) in both electrically (i.e. by bias voltage, referred to as E-MIT) and thermally (T-MIT) driven transitions. We examine transient switching characteristics of the E-MIT and observe two distinguishable time scales for switching. We find an abrupt jump in conductivity with a rise time of the order of 10 ns followed by an oscillatory damping to steady state on the order of several μs. We characterize the RF power response in the On state and find that high RF input power drives VO2 further into the metallic phase, indicating that electromagnetic radiation-switching of the phase transition may be possible. We measure S-parameter RF properties up to 13.5 GHz. Insertion loss is markedly flat at 2.95 dB across the frequency range in the On state and sufficient isolation of over 25 dB is observed in the Off state. We are able to simulate the RF response accurately using both lumped element and 3D electromagnetic models. Extrapolation of our results suggests that optimizing device geometry can reduce insertion loss further and maintain broadband flatness up to 40 GHz.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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