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Metal-insulator-semiconductor optoelectronic fibres

机译：金属-绝缘体-半导体光电纤维

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摘要

The combination of conductors, semiconductors and insulators with well-defined geometries and at prescribed length scales, while forming intimate interfaces, is essential in most functional electronic and optoelectronic devices. These are typically produced using a variety of elaborate wafer-based processes, which allow for small features, but are restricted to planar geometries and limited coverage area(1-3). In contrast, the technique of fibre drawing from a preformed reel or tube is simpler and yields extended lengths of highly uniform fibres with well-controlled geometries and good optical transport characteristics(4). So far, this technique has been restricted to particular materials(5-7) and larger features(8-12). Here we report on the design, fabrication and characterization of fibres made of conducting, semiconducting and insulating materials in intimate contact and in a variety of geometries. We demonstrate that this approach can be used to construct a tunable fibre photodetector comprising an amorphous semiconductor core contacted by metallic microwires, and surrounded by a cylindrical-shell resonant optical cavity. Such a fibre is sensitive to illumination along its entire length ( tens of meters), thus forming a photodetecting element of dimensionality one. We also construct a grid of such fibres that can identify the location of an illumination point. The advantage of this type of photodetector array is that it needs a number of elements of only order N, in contrast to the conventional order N-2 for detector arrays made of photodetecting elements of dimensionality zero.
机译：在大多数功能性电子和光电设备中，具有明确定义的几何形状和规定长度范围的导体，半导体和绝缘体的组合，同时形成紧密的界面，是必不可少的。这些通常使用各种复杂的基于晶圆的工艺来生产，这些工艺具有小的特征，但仅限于平面几何形状和有限的覆盖区域（1-3）。相比之下，从预成型的卷轴或管中拉制纤维的技术更简单，并且可以产生扩展长度的高度均匀的纤维，具有可控的几何形状和良好的光学传输特性（4）。到目前为止，该技术仅限于特定的材料（5-7）和较大的特征（8-12）。在这里，我们将介绍由紧密接触且具有各种几何形状的导电，半导电和绝缘材料制成的纤维的设计，制造和特性。我们证明了该方法可用于构建可调谐光纤光电探测器，该探测器包括与金属微丝接触并被圆柱壳共振光学腔包围的非晶半导体芯。这种光纤对沿其整个长度（数十米）的照明敏感，因此形成一维的光检测元件。我们还构建了此类纤维的网格，可以识别照明点的位置。这种类型的光电检测器阵列的优点在于，与由维数为零的光电检测元件制成的检测器阵列的常规N-2阶相比，它仅需要N阶的多个元素。

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