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Template-directed high-pressure growth of single-crystal wires within microstructured optical fibers.

机译：模板指导的微结构光纤中单晶线的高压生长。

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摘要

Microstructured optical fibers (MOFs) have received considerable recent interest due to their novel optical guiding properties and interesting structural design. The structure of these fibers possess capillary holes extending axially within the fiber cladding, which also presents the opportunity for material infusion and the potential for multifunctional optoelectronic devices. Several devices have been realized using gases and liquids in as-drawn fibers, but there are few examples of solid-state material infusion into the capillaries and only one in as-drawn fibers. The research presented in this thesis represents the first demonstration of template-directed, single-crystal wire growth using high-pressure gas. It is also the first demonstration of this type within an extreme aspect-ratio silica capillary fiber, which could lead to a number of technologically innovative developments.;Single-crystal silicon wires were grown within silica capillary MOFs using the well-known vapor-liquid-solid (VLS) technique. VLS requires the presence of a metal catalyst, which has a low eutectic temperature with silicon. Gold serves this purpose well and was deposited by a technique created in our laboratory called laser-assisted supercritical fluid deposition (LASCFD). The single-crystal wires were analyzed using optical microscopy and Raman spectroscopy while still encased in the MOF. Femtosecond laser micromachining and buffered-oxide etching were used to remove the single-crystal microwire for analysis by scanning electron microscopy and focused-ion-beam (FIB) milling was used to prepare samples for transmission electron microscopy. The FIB thinned microwires exhibited both 111> and 112> growth directions, which is consistent with previous reports. A number of processing and experimental conditions including temperature, pressure, and gold deposition are examined for their impact on growth of long, single-crystal microwires.
机译：由于其新颖的光导特性和有趣的结构设计，微结构光纤（MOF）受到了广泛的关注。这些光纤的结构具有在光纤包层内轴向延伸的毛细管孔，这也为材料注入提供了机会，并为多功能光电设备提供了潜力。已经实现了在拉伸纤维中使用气体和液体的几种装置，但是很少有将固态材料注入毛细管的例子，而在拉伸纤维中只有一种例子。本文提出的研究代表了使用高压气体进行模板定向单晶丝生长的首次演示。这也是在超长宽比的二氧化硅毛细管纤维中进行的这种类型的首次展示，这可能会导致许多技术创新的发展。；单晶硅线是在二氧化硅毛细管MOF中使用众所周知的蒸气-液体生长的-固体（VLS）技术。 VLS需要存在金属催化剂，该催化剂与硅的共晶温度低。金很好地达到了这一目的，它是由我们实验室创建的一种称为激光辅助超临界流体沉积（LASCFD）的技术沉积的。使用光学显微镜和拉曼光谱分析单晶线，同时仍将其装入MOF中。飞秒激光微加工和缓冲氧化物蚀刻用于去除单晶微丝，以便通过扫描电子显微镜进行分析，聚焦离子束（FIB）铣削用于制备透射电子显微镜样品。 FIB细线显示了<111>和<112>的生长方向，这与以前的报道一致。研究了包括温度，压力和金沉积在内的许多加工和实验条件对长单晶微丝生长的影响。

著录项

  • 作者

    Jackson, Bryan R.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 173 p.
  • 总页数 173
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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