Experimental realization of optical lumped nanocircuits at infrared wavelengths
Experimental realization of optical lumped nanocircuits at infrared wavelengths
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DOI：
10.1038/nmat3230
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发表时间：
2012-03-01
期刊：
影响因子：
41.2
通讯作者：
Engheta, Nader
中科院分区：
文献类型：
--
作者：
Sun, Yong;Edwards, Brian;Engheta, Nader
射频电子方法在微观和纳米尺度平台上的集成对于信息处理和数据存储技术至关重要（1-3）。在电子学中，射频信号由“集总”电路元件控制和操纵，如电阻、电感和电容器。在早期的工作（4,5）中，我们从理论上提出，如果设计得当并合理安排，光学纳米结构可以表现为纳米级集总电路元件，但在光学频率上。在这里，我们首次在实验上展示了一个中红外波长的二维光学纳米电路。在电路理论的指导下，我们设计和制作了具有特定深亚波长截面的氮化硅纳米棒阵列，定量地评估了其作为中红外区集总电路元件的等效阻抗，并通过傅里叶变换红外光谱表明这些纳米结构确实可以作为二维光学集总电路元件。我们进一步证明了纳米电路元件之间的连接，特别是它们是串联还是并联组合，都可以通过碰撞光信号的偏振来控制，实现了元电子-超材料启发光电路中的“立体电路”概念。
The integration of radiofrequency electronic methodologies on micro-as well as nanoscale platforms is crucial for information processing and data-storage technologies(1-3). In electronics, radiofrequency signals are controlled and manipulated by 'lumped' circuit elements, such as resistors, inductors and capacitors. In earlier work(4,5), we theoretically proposed that optical nanostructures, when properly designed and judiciously arranged, could behave as nanoscale lumped circuit elements-but at optical frequencies. Here, for the first time we experimentally demonstrate a two-dimensional optical nanocircuit at mid-infrared wavelengths. With the guidance of circuit theory, we design and fabricate arrays of Si3N4 nanorods with specific deep subwavelength cross-sections, quantitatively evaluate their equivalent impedance as lumped circuit elements in the mid-infrared regime, and by Fourier transform infrared spectroscopy show that these nanostructures can indeed function as two-dimensional optical lumped circuit elements. We further show that the connections among nanocircuit elements, in particular whether they are in series or in parallel combination, can be controlled by the polarization of impinging optical signals, realizing the notion of 'stereo-circuitry' in metatronics-metamaterials-inspired optical circuitry.