Opportunities for research on single-crystal fibers

Single-crystal fibers represent a virtually untapped source of opportunity for both materials and device research. These quasi-one-dimensional materials which can be used individually or in fiber bundles can combine the light-guiding properties of fibers with the diverse range of properties available in single-crystal materials. Light guiding can be enhanced with the use of refractive-index-matched claddings. In recent years the laser-heated pedestal growth method has been shown to be one of the most versatile techniques for growing device quality single-crystal fibers of uniform diameter. The method may be the easiest and the fastest method known for producing small single crystals for property analysis, and its use for this purpose has been growing. This paper discusses some of the interesting opportunities available for single-crystal fiber materials and device research.