Tailoring the losses of optical systems within the frame of non-Hermitian physics has appeared very fruitful in the past few years. In particular, the description of exceptional points (EPs) with coupled resonators has become widespread. The on-chip realization of these functionalities is crucial for integrated nanophotonics but requires fine control techniques of the nanodevice properties. Here, we demonstrate pump-controlled directional emission of two coupled nanolasers that distantly interact via an integrated waveguide. This coupling scheme unusually enables both frequency and loss couplings between two cavities, which can be advantageously exploited to reach EPs by either detuning the cavities or controlling the gain of nanolasers. The system can be readily reconfigured from bidirectional to unidirectional emission by adjusting the pump power.

中文翻译：

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利用奇异点附近的耦合纳米激光器进行定向发射


在过去几年中，在非厄米特物理学的框架内定制光学系统的损耗似乎非常富有成效。特别是，对耦合谐振器的异常点 （EP） 的描述已经变得很普遍。这些功能的片上实现对于集成纳米光子学至关重要，但需要纳米器件特性的精细控制技术。在这里，我们展示了两个耦合纳米激光器的泵浦控制定向发射，它们通过集成波导远距离相互作用。这种耦合方案不同寻常地实现了两个腔之间的频率和损耗耦合，可以通过失谐腔或控制纳米激光器的增益来有利地利用它来达到 EP。通过调整泵功率，该系统可以很容易地从双向排放重新配置为单向排放。