Alkaline oxide interface modifiers for silicon fiber production

Abstract

We demonstrate the ability to pull small diameter silicon-core fibers with low oxygen content by using interface modifiers between the silica cladding and the semiconductor. Alkali earths scavenge oxygen and form a fine-structured eutectic that accommodates thermal strain and may be useful as an intermediate index cladding layer for optical applications. NaO, MgO, SrO, CaO and BaO interface modifiers were tested. CaO coated fibers were made with core diameters down to 10 microns, small bending radii, low oxygen incorporation, and optical losses below 4 dB/cm at 1.55 microns.

Crystalline silicon core fibres from aluminium core preforms

“…The redraw technique could also be applied to achieve nanometer-scale Si wires 23 . Also the thin interface layer that lies between the core and the cladding as seen in Figs 2i and 3j could be of interest for the potential advantage on oxygen gettering and surface modification for the post-drawing process 18,39 . The smoothness of the Si is verified in the atomic force scan (AFM) image ( Supplementary Fig.…”

Interfacing Telecom Fibers and Silicon Core Fibers with Nano-Spikes for In-Fiber Silicon Devices

“…A thin layer of calcium oxide (CaO) was first coated inside the silica capillary tube to prevent oxygen in-diffusing during the process. This coating, which is a mixture of CaO and SiO2 [10], also serves as an intermediate index cladding (IIC) and stressreducing layer. A phosphorus doped silicon rod (0.13-0.145 ohm-cm) was then sleeved into the silica tube and was drawn into a fiber using standard fiber drawing process at a temperature of 1950ºC.…”

Crystalline GaSb-core optical fibers with room-temperature photoluminescence

“…The literature on Group IV semiconductor-core glass fibers is now significant [1][2][3][4][5], including processing improvements [6][7][8] and device demonstrations [9][10][11][12][13][14][15][16][17]. There are also reports on both SiGe alloy and II-VI core fibers [18][19][20][21][22][23], one including low temperature photoluminescence [21].…”