Photonics and Electronics Science and Engineering Center, Kyoto University, Kyoto, Japan.
Department of Electronic Science and Engineering, Kyoto University, Kyoto, 615-8510, Japan.
Nat Commun. 2023 Jan 27;14(1):50. doi: 10.1038/s41467-022-35599-2.
Ultrafast dynamics in nanophotonic materials is attracting increasing attention from the perspective of exploring new physics in fundamental science and expanding functionalities in various photonic devices. In general, such dynamics is induced by external stimuli such as optical pumping or voltage application, which becomes more difficult as the optical power to be controlled becomes larger owing to the increase in the energy required for the external control. Here, we demonstrate a concept of the self-evolving photonic crystal, where the spatial profile of the photonic band is dynamically changed through carrier-photon interactions only by injecting continuous uniform current. Based on this concept, we experimentally demonstrate short-pulse generation with a high peak power of 80 W and a pulse width of <30 ps in a 1-mm-diameter GaAs-based photonic crystal. Our findings on self-evolving carrier-photon dynamics will greatly expand the potential of nanophotonic materials and will open up various scientific and industrial applications.
超快动力学在纳米光子学材料中受到越来越多的关注，从探索基础科学中的新物理和扩展各种光子器件的功能的角度来看都是如此。一般来说，这种动力学是由外部刺激引起的，例如光泵浦或电压施加，由于外部控制所需的能量增加，因此要控制的光功率越大，这种动力学就越难实现。在这里，我们展示了自演变光子晶体的概念，其中通过载流子-光子相互作用仅通过注入连续均匀电流就可以动态地改变光子带的空间分布。基于这一概念，我们在直径为 1 毫米的 GaAs 基光子晶体中实验演示了具有 80 W 高峰值功率和 <30 ps 脉冲宽度的短脉冲产生。我们在自演变载流子-光子动力学方面的发现将极大地扩展纳米光子学材料的潜力，并将开辟各种科学和工业应用。
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