对称破缺实现的光子晶体Fano结构的非互易传输
Nonreciprocal transmission in a photonic-crystal Fano structure enabled by symmetry breaking
摘要：
具有非互易光传输特性的纳米结构是用于实现光子集成电路的高度期望的构建块。在这里，一个简单的和超紧凑的光子晶体结构，其中波导耦合到一个单一的纳米腔，提出和实验证明，显示非常有效的光学二极管功能。该结构的关键新颖性在于结合空间对称性破缺和腔增强材料非线性使用Fano谐振，以在超低功率下实现非互易传播效应并具有良好的波长可调谐性。该器件的非线性依赖于超快载波动力学，而不是通常考虑的热效应，允许在10 Gbit/s的比特率下以4.5 fJ/bit的低能耗演示非互易操作。
英文摘要：
Nanostructures that feature nonreciprocal light transmission are highly desirable building blocks for realizing photonic integrated circuits. Here, a simple and ultra-compact photonic-crystal structure, where a waveguide is coupled to a single nanocavity, is proposed and experimentally demonstrated, showing very efficient optical diode functionality. The key novelty of the structure is the use of a Fano resonance in combination with spatial symmetry breaking and cavity enhanced material nonlinearities to realize non-reciprocal propagation effects at ultra-low power and with a good wavelength tunability. The nonlinearity of the device relies on ultrafast carrier dynamics, rather than the thermal effects usually considered, allowing the demonstration of nonreciprocal operation at a bit-rate of 10 Gbit/s with a low energy consumption of 4.5 fJ/bit.
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