Fabrication of Schottky Photodetector by using Si-cored fibers
Date Issued
2015
Date
2015
Author(s)
Huang, Yan-Bo
Abstract
Recently the combination of semiconductor materials with fiber optics has become one of the emerging research topics. Such combination of semiconductor and fiber optics may lead to various applications in Si photonics, bio-chemical sensing, and all-optical modulation. In this thesis, we demonstrated a method of fabricating silicon cored fiber. In this study, a technique featuring powder-in-tube and vertical-drawing was adopted for making single-crystal Si-cored fibers. Much cheaper polycrystalline Si powders substituting expensive single-crystal Si powders or seed rods were packed into a fused silica tube. By optimizing the drawing parameters, meter-long Si-cored fibers were obtained. Because the electrical and optical characteristics of Si are much affected by the crystallinity of Si, we need first analyze the crystallinity of Si-cored fibers, and then measure their electrical and optical characteristics. The measured result showed that our Si-cored fibers displayed excellent single crystallinity confirmed by micro-Raman spectra and high-resolution transmission electron microscope images. The Si-cored fibers also exhibited outstanding optical and electrical properties. With the above merits, a Si Schottky photodetector (SSPD) made by using a Si-cored fiber is demonstrated. Based on the internal photoemission process, SSPD can work in telecom regimes where Si is well known as transparent. Furthermore, another major advantage is that the inherent waveguide property of Si-cored fiber enabled an SSPD to be spliced with a receiving silica fiber, which can eliminate the need of cumbersome optical coupling.
Subjects
semiconductor fibers
silicon cored fibers
Schottky photodetector
Type
thesis
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