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Optical routing and sensing with nanowire assemblies

机译：纳米线组件的光路由和传感

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The manipulation of photons in structures smaller than the wavelength of light is central to the development of nanoscale integrated photonic systems for computing, communications, and sensing. We assemble small groups of freestanding, chemically synthesized nanoribbons and nanowires into model structures that illustrate how light is exchanged between subwavelength cavities made of three different semiconductors. The coupling strength of the optical linkages formed when nanowires are brought into contact depends both on their volume of interaction and angle of intersection. With simple coupling schemes, lasing nanowires can launch coherent pulses of light through ribbon waveguides that are up to a millimeter in length. Also, interwire coupling losses are low enough to allow light to propagate across several right-angle bends in a grid of crossed ribbons. The fraction of the guided wave traveling outside the wire/ribbon cavities is used to link nanowires through space and to separate colors within multiribbon networks. In addition, we find that nanoribbons function efficiently as waveguides in liquid media and provide a unique means for probing molecules in solution or in proximity to the waveguide surface. Our results lay the spadework for photonic devices based on assemblies of active and passive nanowire elements and presage the use of nanowire waveguides in microfluidics and biology.
机译：在小于光波长的结构中对光子进行操纵对于开发用于计算，通信和传感的纳米级集成光子系统至关重要。我们将一小组独立的，化学合成的纳米带和纳米线组装成模型结构，这些模型结构说明了如何在由三种不同的半导体制成的亚波长腔之间交换光。当纳米线接触时形成的光学连接的耦合强度取决于它们的相互作用量和交叉角。利用简单的耦合方案，激光纳米线可以通过带状波导发射相干的光脉冲，该带状波导的长度可达一毫米。而且，线间耦合损耗足够低，以允许光穿过交叉的带状网格中的几个直角弯曲传播。导线/碳带腔外传播的一部分导波被用于通过空间链接纳米线，并在多碳带网络中分离颜色。此外，我们发现纳米带在液体介质中有效地充当波导，并为探测溶液中或接近波导表面的分子提供了独特的手段。我们的研究结果为基于有源和无源纳米线元件组装的光子器件开辟了道路，并预示了纳米线波导在微流体和生物学中的应用。

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