Ultrafast direct modulation of a single-mode photonic crystal nanocavity light-emitting diode.
Ultrafast direct modulation of a single-mode photonic crystal nanocavity light-emitting diode.
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DOI：
10.1038/ncomms1543
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发表时间：
2011-11-15
影响因子：
16.6
通讯作者：
Vuckovic, Jelena
中科院分区：
文献类型：
--
作者：
Shambat, Gary;Ellis, Bryan;Vuckovic, Jelena
低功率和电控光源对于下一代光互连系统满足严格的能源需求至关重要。目前由高阈值激光器和外部调制器组成的光发射器消耗太多的功率，无法与未来的电互连竞争。在这里，我们展示了一种直接调制的光子晶体纳米腔发光二极管（LED），具有10GHz的调制速度和小于1fJ的每比特的操作能量，这是数量级低于以前的解决方案。该器件是电控的，并在室温下工作，而高调制速度来自于用作活性材料的量子点的快速弛豫。凭借拥有一个小的模式体积，我们的LED本质上是单一模式，因此，有用的通信信息在一个单一的窄带通道。所展示的器件是为片上光子学提供实用的低功耗和可集成源的重要一步。
Low-power and electrically controlled optical sources are vital for next generation optical interconnect systems to meet strict energy demands. Current optical transmitters consisting of high-threshold lasers plus external modulators consume far too much power to be competitive with future electrical interconnects. Here we demonstrate a directly modulated photonic crystal nanocavity light-emitting diode (LED) with 10GHz modulation speed and less than 1fJ per bit energy of operation, which is orders of magnitude lower than previous solutions. The device is electrically controlled and operates at room temperature, while the high modulation speed results from the fast relaxation of the quantum dots used as the active material. By virtue of possessing a small mode volume, our LED is intrinsically single mode and, therefore, useful for communicating information over a single narrowband channel. The demonstrated device is a major step forward in providing practical low-power and integrable sources for on-chip photonics.