硅兼容非制冷紧凑型宽带红外光谱仪
A Silicon-Compatible Uncooled Compact Broadband Infrared Spectrometer
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中文总结 AI 辅助
本文开发了一种集成GeSn光电探测器与单像素架构的硅兼容非制冷紧凑型宽带红外光谱仪，可实现室温下的宽带红外光谱检测，能有效区分商品塑料，为分布式分子传感等领域提供了便携方案。
中文摘要 AI 辅助
红外光谱技术是广泛应用于分子识别的技术，但其广泛部署仍受限于庞大的仪器、低温冷却要求和有限的便携性。本文展示了宽带近红外至短波红外光谱技术，该技术由硅兼容的GeSn光电探测器实现，该探测器集成到基于数字微镜器件（DMD）的紧凑型单像素架构中。通过结合探测器设计与针对性的光学重构和波长校准，我们将工作范围扩展至2.4微米，同时保持室温、零偏置光伏操作。系统级基准测试量化了窄带隙光电探测中光谱扩展与探测率之间的固有权衡，在1.55微米波长下，随着波长截止扩展，比探测率达到$1.12 \ imes 10^{10}$ cm Hz$^{1/2}$ W$^{-1}$。我们通过选择性识别代表性商品塑料验证了所制备光谱仪的性能，展示了一种轻质、低功耗且机械坚固的平台，适用于便携式和自主部署。尽管预计会出现产生限制噪声的增加，但获取1.7微米以上的强聚合物组合带可增强材料区分能力。本研究为可扩展的分布式分子传感奠定了路径，并拓宽了红外光谱在环境监测、工业过程控制和社区级化学检测中的应用。
英文摘要
Infrared spectroscopy is a widely used technique for molecular identification, yet its widespread deployment remains constrained by bulky instrumentation, cryogenic cooling requirements, and limited portability. Here we demonstrate broadband near- to short-wave infrared spectroscopy enabled by a silicon-compatible GeSn photodetector integrated into a compact digital micromirror device-based single-pixel architecture. By combining detector design with targeted optical reconfiguration and wavelength recalibration, we extend the operational range up to 2.4 micrometers while maintaining room-temperature, zero-bias photovoltaic operation. System-level benchmarking quantifies the intrinsic trade-off between spectral extension and detectivity in narrow-bandgap photodetection, yielding a specific detectivity of $1.12 \times 10^{10}$ cm Hz$^{1/2}$ W$^{-1}$ at 1.55 micrometers with an extended wavelength cut-off. We validate the capabilities of the obtained spectrometer through selective identification of representative commodity plastics, demonstrating a lightweight, low-power, and mechanically robust platform for portable and autonomous deployment. Despite the expected increase in generation-limited noise, access to strong polymer combination bands beyond 1.7 micrometers allows enhanced material discrimination. This work establishes a pathway toward scalable distributed molecular sensing and broadens access to infrared spectroscopy for environmental monitoring, industrial process control, and community-level chemical detection.
