Silicon waveguide structures are a viable alternative for the transmission of signals over a wide range of frequencies, and new fabrication methods are key to increased applications. In this work, THz transparency of silicon-core, silica clad fibers, refined using a traveling solvent method, is demonstrated. The ≈ 200 µm core of these fibers is shown to have good transmission from 4.8–9 µm and 1–7 THz. Fibers were drawn on a conventional optical fiber tower using the scalable molten core technique and CO2 laser annealed, resulting in large-grain crystalline cores with broadband transmission. The spectral properties are comparable to those of rectangular guides of similar cross-sectional area cut from high resistivity float zone silicon wafers.

中文翻译：

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宽带红外和太赫兹传输硅芯光纤

硅波导结构是在很宽的频率范围内传输信号的可行替代方案，而新的制造方法是增加应用的关键。在这项工作中，展示了使用流动溶剂法精制的硅芯、二氧化硅包层光纤的 THz 透明度。这些光纤的 ≈ 200 µm 纤芯在 4.8–9 µm 和 1–7 THz 范围内具有良好的传输性能。使用可扩展熔融纤芯技术和 CO2 激光退火在传统光纤塔上拉制光纤，从而产生具有宽带传输的大晶粒晶体纤芯。光谱特性与从高电阻率浮区硅晶片切割的具有相似横截面面积的矩形波导的光谱特性相当。