Zeptojoule通过参数频率上升转换检测到太赫兹脉冲
Optics letters
|March 15, 2024
概括
我们开发了一种特拉赫兹 (THz) 探测器,使用频率上升转换和单光子计数,具有zeptojoule (zJ) 灵敏度. 这一突破使得精确的THz脉冲能量检测能够用于先进的光谱和成像应用.
科学领域:
- 光学和光子学 在光学和光子学.
- 量子技术 量子技术 量子技术
- 频谱学是一种光谱学.
背景情况:
- 太赫兹 (THz) 检测需要高灵敏度,用于光谱,成像和通信应用.
- 目前的THz检测方法,如电光采样 (EOS),在灵敏度和速度上有局限性.
- 单光子计数和非线性光学的进步为增强THz检测能力提供了潜力.
研究的目的:
- 开发一种具有超高灵敏度的新型THz检测方案.
- 将参数频率上升转换与单光子计数相结合,以改进THz检测.
- 为了证明开发的系统对THz光谱学的能力.
主要方法:
- 使用参数频率上升转换将THz辐射转移到近红外 (NIR) 波长.
- 采用了GaP非线性晶体,以实现高效的频率转换.
- 集成了一个单光子雪崩二极管 (SPAD),用于高度灵敏地检测上转换的光子.
- 部署了光学波器,以隔离NIR信号从超快源.
主要成果:
- 实现了THz检测灵敏度降至1.4 zeptojoule (zJ) 脉冲能量,相当于每脉冲1.5光子.
- 证明了一次性THz脉冲检测超过1185 zJ.
- 获得的噪声等效功率为1.3×10-16W/Hz1/2和THz-to-NIR光子检测效率为5.8×10-2%.
- 成功执行1到3.7 THz之间的水蒸气光谱,光谱分辨率为0.2 THz,与标准EOS方法一致.
结论:
- 开发的THz检测方案提供了前所未有的灵敏度,达到zeptojoule级别.
- 这种技术为THz光谱学提供了传统EOS的快速和灵敏的替代方案.
- 该系统的功能适用于各种应用,包括光谱,成像和光通信.
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