Quantum coherence in an optical modulator
Quantum coherence in an optical modulator
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DOI：
10.1126/science.1116195
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发表时间：
2005-10-28
期刊：
影响因子：
56.9
通讯作者：
Sherwin, MS
中科院分区：
文献类型：
--
作者：
Carter, SG;Birkedal, V;Sherwin, MS
半导体量子阱电吸收调制器广泛用于调制频率低于0.1太赫兹（THz）的近红外辐射。在这里，未掺杂量子阱的近红外吸收被频率在1.5到3.9太赫兹之间的强电场调制。太赫兹场耦合了量子阱的两个激发态（激子），这表现在一个新的太赫兹频率和功率相关的近红外吸收线上。非摄动理论和实验表明，太赫兹场产生了一个吸收激子和一个非吸收激子的相干量子叠加。这种量子相干性可能会产生量子阱调制器的新应用。光学通信。
Semiconductor quantum well electroabsorption modulators are widely used to modulate near-infrared (NIR) radiation at frequencies below 0.1 terahertz (THz). Here, the NIR absorption of undoped quantum welts was modulated by strong electric fields with frequencies between 1.5 and 3.9 THz. The THz field coupled two excited states (excitons) of the quantum wells, as manifested by a new THz frequency- and power-dependent NIR absorption line. Nonperturbative theory and experiment indicate that the THz field generated a coherent quantum superposition of an absorbing and a nonabsorbing exciton. This quantum coherence may yield new applications for quantum well modulators in. optical communications.