arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.08018physics.opticscond-mat.mes-hall
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提高载波包络相位灵敏度的纳米天线设计

Nanoantenna Design for Enhanced Carrier-Envelope-Phase Sensitivity

Drew Buckley, Yujia Yang, Yugu Yang-Keathley, Karl K. Berggren, Phillip D. Keathley

摘要:

来自纳米结构固体(如亚波长纳米天线)的光场发射可以被利用来创建用于光场检测的亚飞秒、PHz级电子器件。特别感兴趣的一个应用是入射光脉冲的载波包络相位的检测。这种载波包络相位检测需要少周期的宽带光激励,其中纳米天线的谐振特性可以强烈地改变近场的响应。很少有定量的研究已经执行,以了解天线的几何形状和谐振特性应如何调整,以提高载波包络相位灵敏度和信噪比。在这里,我们研究如何平面等离子体纳米天线的几何形状和谐振频率可以被设计用于增强发射的载波包络相位敏感的光电流时,由几个周期的光脉冲驱动。我们发现,通过简单地添加导致顶点的弯曲侧壁,以及适当地调谐谐振波长,可以通过$5$来改善每个纳米天线的净CEP敏感电流,并且相对于谐振操作的简单三角形天线,通过$50$ - $100\times$来改善信噪比。我们的研究结果将为下一代纳米天线设计提供信息,用于超快光电子计量学和拍赫兹电子学的新兴应用。

英文摘要:

Optical-field emission from nanostructured solids such as subwavelength nanoantennas can be leveraged to create sub-femtosecond, PHz-scale electronics for optical-field detection. One application that is of particular interest is the detection of an incident optical pulse's carrier-envelope phase. Such carrier-envelope-phase detection requires few-cycle, broadband optical excitation where the resonant properties of the nanoantenna can strongly alter the response of the near field in time. Little quantitative investigation has been performed to understand how the geometry and resonant properties of the antennae should be tuned to enhance the carrier-envelope phase sensitivity and signal to noise ratio. Here we examine how the geometry and resonance frequency of planar plasmonic nanoantennas can be engineered for enhancing the emitted carrier-envelope-phase-sensitive photocurrent when driven by a few-cycle optical pulse. We find that with the simple addition of curved sidewalls leading to the apex, and proper tuning of the resonance wavelength, the net CEP-sensitive current per nanoantenna can be improved by $5$-$10\times$, and the signal-to-noise-ratio by $50$-$100\times$ relative to simple triangular antennas operated on resonance. Our findings will inform the next generation of nanoantenna designs for emerging applications in ultrafast photoelectron metrology and petahertz electronics.

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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