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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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    我们开发了一种能够单光子计数的中红外 (MIR) 光探测和测距 (LiDAR) 系统. 这一突破使得各种应用的高分辨率MIR成像成为可能.

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    科学领域:

    • 物理 物理学 物理
    • 光学工程是指光学工程.
    • 光子学是指光子学的使用方法.

    背景情况:

    • 中红外 (MIR) 单光子检测对于通信,传感,天文学和生物医学等应用至关重要.
    • 在MIR中直接与时间相关的单光子计数一直是一个重要的技术障碍.

    研究的目的:

    • 展示一个单像素扫描光检测和距离测定 (LiDAR) 系统,在单光子水平上在MIR中运行.
    • 通过使用先进的超导纳米线单光子探测器 (SNSPD) 来实现MIR LiDAR的亚毫米深度分辨率.

    主要方法:

    • 采用了优化用于MIR波长的烯化 (WSi) 超导纳米线单光子探测器 (SNSPD).
    • 采用光学参数振荡器 (OPO) 激光源,在3500nm运行.
    • 实现了一个单像素扫描激光雷达配置,用于深度分析.

    主要成果:

    • 在3500nm的单光子模式下实现了亚毫米深度分辨率.
    • 证明了探测器能够在100毫米的距离上分辨细微特征的能力.
    • 描述了波长依赖的光响应和时间动,从1550nm到5438nm.

    结论:

    • 开发的MIR LiDAR系统具有宽带操作,高定时性能和单光子灵敏度.
    • 这项工作突显了SNSPDs为高级应用所启用的MIR时间相关单光子计数的潜力.