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Theoretical investigation on super-resolution refractive index measurement with parity detection

WANG Qiang WANG Qian-qian WANG Zhen HAO Li-li

王强, 王倩倩, 王振, 郝利丽. 奇偶探测超分辨率折射率测量的理论研究[J]. 中国光学(中英文), 2023, 16(2): 434-446. doi: 10.37188/CO.2022-0119
引用本文: 王强, 王倩倩, 王振, 郝利丽. 奇偶探测超分辨率折射率测量的理论研究[J]. 中国光学(中英文), 2023, 16(2): 434-446. doi: 10.37188/CO.2022-0119
WANG Qiang, WANG Qian-qian, WANG Zhen, HAO Li-li. Theoretical investigation on super-resolution refractive index measurement with parity detection[J]. Chinese Optics, 2023, 16(2): 434-446. doi: 10.37188/CO.2022-0119
Citation: WANG Qiang, WANG Qian-qian, WANG Zhen, HAO Li-li. Theoretical investigation on super-resolution refractive index measurement with parity detection[J]. Chinese Optics, 2023, 16(2): 434-446. doi: 10.37188/CO.2022-0119

奇偶探测超分辨率折射率测量的理论研究

详细信息
  • 中图分类号: O436.1;TN249

Theoretical investigation on super-resolution refractive index measurement with parity detection

doi: 10.37188/CO.2022-0119
Funds: Supported by Guiding Innovation Fund of Northeast Petroleum University (No. 2021YDL-16); Heilongjiang Province Education Planning Key Project (No. GJB1320038 , No. GJB1422173); The Education Teaching Reform Project of Northeast Petroleum University (No. JGXM_NEPU_202114)
More Information
    Author Bio:

    Wang Qiang (1980—), male, born in Baiquan, Heilongjiang Province, Ph.D., associate professor, master student supervisor. In 2006 and 2016, he obtained master degree and Ph.D. degree from Harbin Institute of Technology, respectively. He is currently engaged in research on quantum interference metrology and sensing, quantum lidar, etc. E-mail: wangqiang8035@163.com

    Hao Li-li (1981—), female, born in Suihua, Heilongjiang Province, Ph.D., associate professor, master student supervisor. She received her master degree and Ph.D. degree from Harbin Institute of Technology in 2007 and 2015 respectively, mainly engaged in the research of quantum optics, spatial optical solitons and optical control devices. E-mail: haolili0820@126.com

    Corresponding author: haolili0820@126.com
  • 摘要:

    传统波动光学法测量样品折射率所采用的探测方法主要是强度探测和波长探测。波长的最佳检测器件为干涉型光谱仪,干涉型光谱仪是通过光功率计测量信号强度、分析条纹数目变化及所对应的光程差,进而计算出信号光波长,因此,其本质仍是以强度探测为基础的。然而,利用强度探测干涉信号,分辨率受经典衍射极限限制,很难得到进一步提升。为了解决这一瓶颈问题,本文提出利用奇偶探测突破经典分辨率的极限限制,实现超分辨率折射率测量。根据量子探测与估计理论,推导了奇偶探测和强度探测折射率测量信号及其灵敏度表达式,并进行了数值对比分析。同时,研究了损耗对系统输出信号分辨率和灵敏度的影响。数值结果表明:奇偶探测分辨率是强度探测的${\text{2{\text{π}}}}\sqrt {{N}} $倍,实现了超分辨率折射率测量,最佳灵敏度达到了折射率测量散弹噪声极限${\lambda / {\left( {2{\text{π}} l\sqrt N } \right)}}$,损耗降低了信号的分辨率和灵敏度,除极大损耗和极低光子数外,奇偶探测信号分辨率始终优于强度探测。最后,从探测手段本身出发分析了奇偶探测超分辨率折射率测量的物理本质。

     

  • 图 1  奇偶探测超分辨率折射率测量原理示意图

    Figure 1.  Schematic diagram of super-resolution refractive index measurement principle using parity detection

    图 2  (a) 强度探测折射率测量灵敏度曲线及(b)信号最佳灵敏度随光子数和透过率的变化关系

    Figure 2.  (a) Sensitivity curve of intensity-detection-based refractive index measurement and (b) signal optimal sensitivity as a function of photon number and transmittance

    图 3  奇偶探测信号和归一化强度探测信号随折射率n的变化,输入信号的平均光子数$N = 100$,红色点线和黑色实线分别代表奇偶探测信号和归一化强度探测信号

    Figure 3.  Signals of parity detection and normalized intensity detection are plotted as a function of refractive index n for the average photon number of $N = 100$. The red dotted line and black solid line represent parity detection (PD) and normalized intensity detection (ID) respectively

    图 4  奇偶探测和强度探测的FWHMs随着平均光子数(a)和透过率(b)的变化规律

    Figure 4.  FWHMs of parity and intensity detections varying with the average photon number (a) and transmittance (b)

    图 5  奇偶探测(红色点线)和强度探测(蓝色实线)信号灵敏度曲线,黑色虚线为两条曲线的公切线

    Figure 5.  Sensitivity curves of parity detection (red dotted line) and intensity detection (blue solid line), and the black dashed line represents their common tangents

    图 6  奇偶探测和强度探测信号最佳灵敏度随着透过率 (a) 和光子数 (b) 的变化曲线,红色点虚线表示奇偶探测,蓝色实线代表强度探测

    Figure 6.  Optimal sensitivity of parity detection and intensity detection signals varying with transmittance (a) and photon number (b). The red dot dashed line indicates parity detection and the blue solid line represents intensity detection

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出版历程
  • 收稿日期:  2022-06-10
  • 修回日期:  2022-07-13
  • 网络出版日期:  2022-09-28

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