We propose a photonic array of resonant circular dielectric waveguides with subwavelength grating that can be designed as a robust and sensitive topological chemical sensor. The device can detect trace amounts of a given chemical species through photonic edge modes that are impervious to most sources of disorder. We perform a simulation in the midinfrared that accounts for the absorption loss introduced by chemical molecules in contact with a strongly coupled photonic lattice of resonators. Due to the topological nature of the device, its chemical sensitivity scales linearly with the system size and can reach parts-per-billion range at the millimeter scale. Our findings suggest that topological chemical sensors could empower the development of novel on-chip integrated photonic sensing technologies.

中文翻译：

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谐振圆形波导光子阵列的拓扑传感

我们提出了一种具有亚波长光栅的谐振圆形介电波导的光子阵列，可以将其设计为坚固且灵敏的拓扑化学传感器。该设备可以通过不受大多数​​无序来源影响的光子边缘模式来检测给定化学物质的痕量。我们在中红外中进行了模拟，该模拟解释了化学分子与谐振器的强耦合光子晶格接触时引入的吸收损耗。由于该设备的拓扑性质，其化学灵敏度与系统尺寸呈线性关系，可以达到毫米级的十亿分之一范围。我们的研究结果表明，拓扑化学传感器可以促进新型片上集成光子传感技术的发展。