空间修饰III-V量子阱上单片集成的无石榴石光环行器
Garnet-free optical circulators monolithically integrated on spatially modified III-V quantum wells
摘要：
光环行器是光子网络中不可或缺的组件，其目的是在其N端口之间以单向方式路由信息1，2。一般来说，这些设备依赖于磁光石榴石3与可观的费尔德常数，利用与其他元件，如永磁体，波片，双折射晶体和/或分束器。因此，这些布置通常体积庞大，因此不利于片上光子集成4 -6。感兴趣的是设计策略，通过该策略，可以在发光半导体平台上单片制造小型化的光学环行器，仅依靠材料本身固有的物理特性。通过利用非厄米性和非线性之间的相互作用，在这里，我们展示了一类新的空间修改的III-V量子阱系统的芯片级循环器。这些无石榴石单向结构在1550 nm处具有宽带（超过2.5 THz），有效无损耗，保色，并且在原理验证演示中，当在毫瓦（mW）功率水平下在脉冲模式条件下使用时，提供了23 dB的隔离。
英文摘要：
Optical circulators are indispensable components in photonic networks that are aimed to route information in a unidirectional way among their N-ports1,2. In general, these devices rely on magneto-optical garnets3 with appreciable Verdet constants that are utilized in conjunction with other elements like permanent magnets, wave-plates, birefringent crystals and/or beam splitters. Consequently, these arrangements are typically bulky and hence not conducive to on-chip photonic integration4-6. Of interest would be to devise strategies through which miniaturized optical circulators can be monolithically fabricated on light-emitting semiconductor platforms by solely relying on physical properties that are indigenous to the material itself. By exploiting the interplay between non-Hermiticity and nonlinearity, here we demonstrate a new class of chip-scale circulators on spatially modified III-V quantum well systems. These garnet-free unidirectional structures are broadband (over 2.5 THz) at 1550 nm, effectively loss-free, color-preserving, and in proof-of-principle demonstrations have provided 23 dB isolation when used under pulsed-mode conditions at milliwatt (mW) power levels.
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