论文标题
频域光学相干断层扫描与未发现的中红外光子
Frequency-domain optical coherence tomography with undetected mid-infrared photons
论文作者
论文摘要
中红外光的散射远小于短波长，可以极大地增强光学成像技术的渗透深度，例如光学相干断层扫描（OCT）。但是，MID-IR中的检测和宽带来源在技术上具有挑战性。在非线性干涉仪中干扰纠缠的光子可以通过未检测到的中IR来源和检测器过时的光子传感。在这里，我们基于超宽带纠缠的光子对实现中红外频域OCT。我们演示了10美元的轴向和20 $μ$ m的横向分辨率2D和3D成像的强烈散射陶瓷和油漆样品。再加上$ 10^6美元的$倍以相同数量的探针光缩放的噪音，并且大大降低了足迹和技术复杂性，这种技术可以用经典的MID-IR光优于常规方法。
Mid-infrared light scatters much less than shorter wavelengths, allowing greatly enhanced penetration depths for optical imaging techniques such as optical coherence tomography (OCT). However, both detection and broadband sources in the mid-IR are technologically challenging. Interfering entangled photons in a nonlinear interferometer enables sensing with undetected photons making mid-IR sources and detectors obsolete. Here we implement mid-infrared frequency-domain OCT based on ultra-broadband entangled photon pairs. We demonstrate 10 $μ$m axial and 20 $μ$m lateral resolution 2D and 3D imaging of strongly scattering ceramic and paint samples. Together with $10^6$ times less noise scaled for the same amount of probe light and also vastly reduced footprint and technical complexity this technique can outperform conventional approaches with classical mid-IR light.
