Integrated optical sensors have garnered much interest for lab-on-chip applications such as chemical and biological sensing and detection. Among various ways for detection schemes, spectral analysis performed by a spectrometer has shown great promise. Typically, such spectrometry is carried out in a relatively large device, owing to the fact that spectral resolution is often dictated by large optical path length. Here, a high-resolution compact spectrometer utilizing random scattering events in a disordered medium is demonstrated. The spectrometer is inverse designed by objective-first method and fabricated using two-photon polymerization technique. The compact spectrometer consists of a disordered photonic structure and an inversed-designed mode decomposer. A spectral resolution of 0.25 nm with a bandwidth of 30 nm in the near-infrared regime is realized from a spectrometer occupying a relatively small footprint of 30 × 12.8 µm². The proposed platform has a great potential to be used as a versatile lightweight and compact spectrometer for various applications including on-chip spectrometer and sensing.

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基于定制无序模式的紧凑型、高分辨率反向设计的片上光谱仪

集成光学传感器引起了芯片实验室应用的极大兴趣，例如化学和生物传感和检测。在各种检测方案中，光谱仪进行的光谱分析显示出了巨大的前景。通常，这种光谱测量是在相对较大的设备中进行的，因为光谱分辨率通常由较大的光路长度决定。在这里，展示了在无序介质中利用随机散射事件的高分辨率紧凑型光谱仪。光谱仪采用物镜优先方法逆向设计，采用双光子聚合技术制造。紧凑型光谱仪由无序光子结构和反向设计的模式分解器组成。光谱分辨率为 0。² . 所提出的平台具有用作多功能轻便紧凑型光谱仪的巨大潜力，适用于各种应用，包括片上光谱仪和传感。