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Spatial sampling of terahertz fields with sub-wavelength accuracy via probe-beam encoding

机译:通过探测光束编码以亚波长精度对太赫兹场进行空间采样

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摘要

Recently,computational sampling methods have been implemented to spatially characterize terahertz (THz) fields.Previous methods usually rely on either specialized THz devices such as THz spatial light modulators or complicated systems requiring assistance from photon-excited free carriers with high-speed synchronization among multiple optical beams.Here,by spatially encoding an 800-nm near-infrared (NIR) probe beam through the use of an optical SLM,we demonstrate a simple sampling approach that can probe THz fields with a single-pixel camera.This design does not require any dedicated THz devices,semiconductors or nanofilms to modulate THz fields.Using computational algorithms,we successfully measure 128 × 128 field distributions with a 62-μm transverse spatial resolution,which is 15 times smaller than the central wavelength of the THz signal (940 μm).Benefitting from the non-invasive nature of THz radiation and sub-wavelength resolution of our system,this simple approach can be used in applications such as biomedical sensing,inspection of flaws in industrial products,and so on.
机译:近年来,已经实现了计算采样方法来对太赫兹(THz)场进行空间表征。以前的方法通常依赖于专用的THz设备(例如THz空间光调制器)或复杂的系统,这些系统需要光子激发的自由载流子的协助并在多个载子之间实现高速同步。这里,通过使用光学SLM对800 nm近红外(NIR)探测光束进行空间编码,我们演示了一种简单的采样方法,可以用单像素相机探测太赫兹场。需要任何专用的THz器件,半导体或纳米薄膜来调制THz场。使用计算算法,我们成功测量了128×128场分布,横向空间分辨率为62μm,比THz信号的中心波长小15倍(940)得益于太赫兹辐射的非侵入性和系统的亚波长分辨率,这种简单的方法可用于生物医学传感,工业产品缺陷检查等应用。

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  • 来源
    《光:科学与应用(英文版)》 |2019年第4期|519-526|共8页
  • 作者单位

    The Institute of Optics, University of Rochester, Rochester, NY 14627, USA;

    The Institute of Optics, University of Rochester, Rochester, NY 14627, USA;

    The Institute of Optics, University of Rochester, Rochester, NY 14627, USA;

    The Institute of Optics, University of Rochester, Rochester, NY 14627, USA;

    The Institute of Optics, University of Rochester, Rochester, NY 14627, USA;

    Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5, Canada;

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  • 入库时间 2024-01-27 02:52:24
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