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通过纳米机械传感器对无线电波进行光学检测
T Bagci1, A Simonsen1, S Schmid2
1Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
Nature
|March 7, 2014
概括
我们开发了一种室温光电机械传感器,用于敏感的射频信号检测. 这种设备可以实现超低噪声,全光学检测和经典和量子电子信号的向上转换.
科学领域:
- 光电力学和光电力学.
- 量子光学是一种量子光学.
- 纳米技术 纳米技术
背景情况:
- 微弱无线电频率 (RF) 和微波信号的灵敏检测和低损失传输对于无线电天文学,医学成像和量子通信等领域至关重要.
- 当前的方法经常面临通过传输线路 (例如,铜线) 显著的信号损失.
- 升级转换到光载波可以通过低损耗光纤实现传输,并利用已建立的量子光学技术来检测信号.
研究的目的:
- 为了展示一个室温光电机械传感器,能够高效的射频信号向上转换和敏感的检测.
- 为了实现检测射频信号作为光学相位移的量子有限灵敏度.
- 探索超低噪声的潜力,全光学检测和量子电子信号的连贯向上转换.
主要方法:
- 使用高质量的纳米膜,集成到射频共振电路中.
- 应用低电压偏差 (<10 V) 来诱导射频电压波动和纳米膜的机械位移之间的强合.
- 同时将纳米膜的位移与反射光合,检测射频信号作为光学相位移.
主要成果:
- 展示了一种室温光电机械传感器,用于射频信号检测,具有量子有限的灵敏度.
- 在微伏范围内达到半波电压,明显低于标准光学调制器.
- 来自量子光噪声和热膜波动的推断噪声贡献,在高合作性下预测噪声温度低至40mK.
结论:
- 开发的传感器为超低噪声提供了一条途径,用于经典电子信号的全光学检测.
- 这项技术有助于将低频量子信号连贯向上转换为光学领域.
- 该设备对需要敏感射频信号恢复的应用具有前景,例如在射电天文学和量子通信中.
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