Opt Express. 2023 May 8;31(10):15942-15952. doi: 10.1364/OE.481081.
We study the performance of a hot-electron bolometer (HEB) operating at THz frequencies based on superconducting niobium nitride films. We report on the voltage response of the detector over a large electrical detection bandwidth carried out with different THz sources. We show that the impulse response of the fully packaged HEB at 7.5 K has a 3 dB cutoff around 2 GHz. Remarkably, detection capability is still observed above 30 GHz in an heterodyne beating experiment using a THz quantum cascade laser frequency comb. Additionally, the HEB sensitivity has been evaluated and an optical noise equivalent power NEP of 0.8 pW/√ has been measured at 1 MHz.
我们研究了基于超导氮化铌薄膜的太赫兹频率热电子 bolometer (HEB) 的性能。我们报告了在不同太赫兹源下进行的大电检测带宽下探测器的电压响应。我们表明，在 7.5 K 下，完全封装的 HEB 的脉冲响应在 2 GHz 左右有 3 dB 的截止频率。值得注意的是，在使用太赫兹量子级联激光频梳的外差拍频实验中，在 30 GHz 以上仍能观察到探测能力。此外，我们还评估了 HEB 的灵敏度，并在 1 MHz 时测量到 0.8 pW/√ 的光噪声等效功率 NEP。
