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Topological lasing in resonant photonic structures

机译：共振光子结构中的拓扑激射

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We exploit topological edge states in resonant photonic crystals to attain strongly localized resonances and demonstrate lasing in these modes upon optical excitation. The use of virtually lossless topologically isolated edge states may lead to a class of thresholdless lasers operating without inversion. One needs, however, to understand whether topological states may be coupled to external radiation and act as active cavities. We study a two-level topological insulator and show that self-induced transparency pulses can directly excite edge states. We simulate laser emission by a suitably designed topological cavity and show that it can emit tunable radiation. For a configuration of sites following the off-diagonal Aubry-Andre-Harper model, we solve the Maxwell-Bloch equations in the time domain and provide a first-principles confirmation of topological lasers. Our results open the road to a class of light emitters with topological protection for applications ranging from low-cost energetically effective integrated laser sources, also including silicon photonics, to strong-coupling devices for studying ultrafast quantum processes with engineered vacuum.
机译：我们利用共振光子晶体中的拓扑边缘状态来获得强烈的局部共振，并在光激发下以这些模式展示激光。使用实际上无损的拓扑隔离边缘状态可能会导致一类无阈值激光器运行而不会反转。但是，需要了解拓扑状态是否可能耦合到外部辐射并充当活动腔。我们研究了两级拓扑绝缘体，并表明自感应的透明脉冲可以直接激发边缘状态。我们通过适当设计的拓扑腔模拟激光发射，并表明它可以发射可调辐射。对于遵循非对角Aubry-Andre-Harper模型的站点的配置，我们在时域中求解Maxwell-Bloch方程，并提供拓扑激光的第一性原理确认。我们的研究结果为具有拓扑保护功能的一类发光器打开了道路，其应用范围从低成本的高能效集成激光源（还包括硅光子）到用于研究工程真空的超快量子过程的强耦合器件。

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  • 来源
    《Physical review》 |2016年第19期|195317.1-195317.6|共6页
  • 作者

    Laura Pilozzi; Claudio Conti;

  • 作者单位

    Institute for Complex Systems, National Research Council (ISC-CNR), Via dei Taurini 19, 00185 Rome, Italy;

    Institute for Complex Systems, National Research Council (ISC-CNR), Via dei Taurini 19, 00185 Rome, Italy;

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