Sørgård Trygve, Hawkins Thomas, Ballato John, Österberg Ulf L, Gibson Ursula J
Opt Express. 2021 Feb 1;29(3):3543-3552. doi: 10.1364/OE.414545.
High speed optical modulation of THz radiation is of interest for information processing and communications applications. In this paper infrared femtosecond pulses are used to generate free carriers that reduce the THz transmission of silicon based waveguides over a broad spectral range. Up to 96% modulation is observed from 0.5 to 7 THz in an optical fiber with a 210 µm diameter gold-doped silicon core. The observed carrier recombination time of 2.0 ± 0.2 ns makes this material suitable for high speed all-optical signal processing. These results show both enhanced modulation depth and reduced carrier lifetime when compared to the performance of a high resistivity float zone silicon rectangular guide with comparable cross sectional area.
太赫兹辐射的高速光调制在信息处理和通信应用中备受关注。在本文中，红外飞秒脉冲被用于产生自由载流子，这些载流子会在很宽的光谱范围内降低硅基波导的太赫兹传输。在直径为210μm的掺金硅芯光纤中，在0.5至7太赫兹范围内观察到高达96%的调制。观察到的载流子复合时间为2.0±0.2纳秒，这使得这种材料适用于高速全光信号处理。与具有可比横截面积的高电阻率浮区硅矩形波导的性能相比，这些结果显示出调制深度增强且载流子寿命缩短。
