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Chinese Journal of Lasers

基于金刚石氮‐空位色心检测矢量信号的甚低频接收天线

付鼎元 Fu Dingyuan, 叶安 Ye An, 唐雨桐 Tang Yutong, Xiaolin Li, 钮月萍 Niu Yueping, 龚尚庆 Gong Shangqing

Published Jan 1, 2025• 3 citations
Publisher

Abstract

甚低频（VLF）指的是3~30 kHz的频段，甚低频无线电波的接收、分析技术在地下成像、全球通信等方面均有重要应用。基于金刚石氮-空位（NV）色心的甚低频接收天线具有体积小、动态范围大、频带范围宽、自带矢量特性等优点。采用连续波光学探测磁共振（ODMR）结合I/Q微波频率调制方法，通过读取NV色心经532 nm激光激发得到的荧光信号，实现了对10 kHz甚低频无线电波的探测，探测灵敏度为14.35 nT/Hz1/2。使用该天线对频率为10 kHz、磁感应强度为30 μT的实时频率调制信号进行通信信号接收实验，实现了比特率为99 bit/s的连续无误码电磁波信号的接收，并绘制其天线方向性图谱，证明了该天线能接收甚低频电磁波信号并具有判断信源方向的能力。

DOI
10.3788/cjl240814

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The nitrogen-vacancy (NV) centers in diamond have the advantages of stable triaxial structure, ultra-long electron spin coherence time and simple optical readout at room temperature. A nitrogen atom in the diamond crystal replaces a carbon atom and a vacancy is generated at the adjacent position, forming a point defect in the C3v space group structure. Its ground state and excited state are both spin triplet states. It is the key to achieving efficient preparation of optical initial state and extracting NV color center’s information in the researches of highly sensitive sensing magnetic detection, temperature detection, biological imaging, quantum computing, etc. However, there was no systematic study on relevant parameters of laser for high-concentration NV color center’s samples in previous experimental studies. Based on a high concentration diamond NV ensemble, we use pulsed optical detection magnetic resonance (ODMR) technology to systematically study the relationship among laser initial polarization time, information reading time and laser power, and the influence of laser incident polarization angle on the accuracy of sensing information. The effects of various laser parameters on the NV1 peak of ODMR on the [111] axis of the NVs of diamond are also investigated. The contrast of ODMR increases firstly with a sigmoid function and then decreases with an e-exponential function as the information reading time increases. The incident polarization angle of the laser is sinusoidal, with a period of 90°. According to the above experimental results, we finally choose the appropriate experimental parameters at 45.8 W/cm2 (300 μs of polarization, 700 ns, reading time, laser incident angle is 220°) for ODMR test. Compared with previous experimental parameters (polarization time was 50 us, read the time of 3000 ns, laser incident angle was 250°), the experimental results show that the contrast of ODMR increases from 2.1% to 4.6%, and the typical magnetic sensitivity is improved from 21.6 nT/Hz1/2 to 5.6 nT/Hz1/2. The optimization of the optical control of NVs in solid diamond is realized. The above results provide an effective support for the detection of high-sensitivity manipulation sensing based on high-concentration NV ensemble.
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集成光子芯片为压缩态光场的产生提供了一个可靠和易于扩展的平台。基于低损耗氮化硅微环谐振腔的四波混频过程是产生压缩态光场的重要途径。本文基于氮化硅材料平台，优化了高质量氮化硅薄膜的制备工艺和微环谐振腔的加工过程，制备出多种尺寸和结构的低损耗氮化硅微环谐振腔。通过搭建的测试系统，系统分析了这些微环谐振腔的透射率、耦合状态和品质因子。实验结果表明，所制备的微环谐振腔具有稳定的本征品质因子，其中横截面尺寸为2000 nm′290 nm微环谐振腔的本征品质因子可达1.5′106，对应的波导传输损耗约为0.23 dB/cm。理论计算表明，该结构最优能够产生片上约9 dB的压缩态光场，当考虑总检测效率为40%时，预估可以直接观察到2 dB的压缩态。该研究为片上产生高质量的连续变量压缩态提供了实验基础。