Room temperature terahertz electro-optic modulation by excitons in carbon nanotubes
Room temperature terahertz electro-optic modulation by excitons in carbon nanotubes
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DOI：
10.1063/1.3470105
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发表时间：
2010-07
影响因子：
4
通讯作者：
T. Ogawa;S. Watanabe;N. Minami;R. Shimano
中科院分区：
文献类型：
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作者：
T. Ogawa;S. Watanabe;N. Minami;R. Shimano
利用太赫兹泵浦和光探针光谱技术研究了室温下强太赫兹脉冲诱导的定向胶束包裹单壁碳纳米管的电吸收。电吸收信号在光通信波长附近的激子共振处增强。该信号表现出对太赫兹电场的二次依赖性，并瞬时跟随太赫兹振荡（101 ps）。观察到的具有太赫兹带宽的超快电光调制表明碳纳米管在高速电光器件中的潜在功能。
We have investigated the electroabsorption of aligned micelle-wrapped single-walled carbon nanotubes induced by intense terahertz (THz) pulses by using THz-pump and optical-probe spectroscopy at room temperature. The electroabsorption signal is enhanced at exciton resonances near the optical communication wavelength. The signal showed a quadratic dependence on the THz electric field and instantaneously followed the THz oscillation (∼1 ps). The observed ultrafast electro-optic modulation with a THz bandwidth suggests the potential functionality of carbon nanotubes in high-speed electro-optic devices.