Dataset for "Thin-film lithium niobate terahertz differential field detectors with a bandwidth reaching 3 terahertz"

Broadband and sensitive detection of terahertz (THz) radiation is critical for advances in fields like telecommunications, spectroscopy, and quantum physics. We present a compact and high-performance THz field detector based on resonant THz antennas printed along near-infrared waveguides on thin-film lithium-niobate. These antennas were shown to have their peak response between 250 GHz to 1 THz depending on their geometry, while the non-resonant nature of the interaction enables THz detection to be achieved up to 3 THz. We show that combining two of such antennas in an integrated Mach Zehnder interferometer allows for a measurement of the discrete time derivative of the THz waveform while using a single antenna measures the instantaneous derivative of the field. Using this approach, we have achieved a noise equivalent intra-cavity field as low as 1.9 V/m for an integration time of 100 ms corresponding to a single-shot noise-equivalent field of 4.6kV/m, using a pulsed laser operating at 1575 nm with 76 uW average power. Our device would enable the next generation of compact detectors for applications in spectroscopy and quantum optics.

宽带高灵敏的太赫兹（THz）辐射探测，对于通信、光谱学与量子物理等领域的技术进步具有关键意义。本研究提出一款基于谐振型太赫兹天线的紧凑型高性能太赫兹场探测器，该天线制备于薄膜铌酸锂衬底，并沿近红外波导排布。研究表明，这类天线的响应峰值位于250吉赫兹至1太赫兹之间，具体数值取决于其几何结构；而该探测过程的相互作用具备非谐振特性，使得太赫兹探测的可覆盖频段最高可达3太赫兹。我们证实，将两枚此类天线集成于马赫-曾德尔干涉仪（Mach Zehnder interferometer）中，可实现太赫兹波形离散时间导数的测量；而单根天线则可用于探测太赫兹场的瞬时导数。采用该方案，我们使用工作波长1575纳米、平均功率76微瓦的脉冲激光器，在100毫秒积分时间下实现了低至1.9伏/米的腔内等效噪声场；对应单次探测的等效噪声场可达4.6千伏/米。本器件将为光谱学与量子光学领域的应用提供新一代紧凑型探测解决方案。