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Microdisplacement sensor based on high-Q nanocavity in slot photonic crystal

机译：缝隙光子晶体中基于高Q纳米腔的微位移传感器

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摘要

A microdisplacement sensor formed by a fixed and mobile hole-array based slot photonic crystal (slot-PhC) components is demon-strated. The sensing technique is based on a nanoscale cavity with a high-Q factor in photonic crystals (PhCs). The high-Q nanocavity (H0-cavity) is formed by only laterally shifting two adjacent holes outwards slightly in the opposite direction. The properties of the microdisplacement sensor are analyzed theoretically and simulated using the finite-difference time-domain method. The simulation results indicate that with a proper operating frequency, a quasilinear measurement of microdisplacement is achieved with a sensitivity of 1.0a~(-1) (a is the lattice constant) in the sens-ing range between 0.00a and 0.20a. Although other researchers such as Xu et al. who demonstrated a micro displacement sensor possessing an equivalent sensitivity, the Q factor is only 40. In this paper, combined with harmonic analysis, we show numerically that an intrinsic Q value of up to 6×10~3 is achieved. In addition, it is worth mentioning that when the pa-rameters of the HO-cavity are determined, the resonant frequency of the HO-cavity remains approximately constant as the mobile PhC segment shifts along the common axis. It will be easier and more accurate for mea-surements in practical applications.
机译：展示了一种微位移传感器，该传感器由基于固定和可移动孔阵列的缝隙光子晶体（slot-PhC）组件形成。传感技术基于光子晶体（PhC）中具有高Q因子的纳米级腔。高Q纳米腔（H0腔）是通过仅沿相反方向稍微向外横向移动两个相邻的孔而形成的。从理论上分析了微位移传感器的特性，并使用时域有限差分法对其进行了仿真。仿真结果表明，在适当的工作频率下，可以在0.00a至0.20a的传感范围内以1.0a〜（-1）（a为晶格常数）的灵敏度实现微位移的准线性测量。尽管其他研究人员，例如徐等。谁证明了微位移传感器具有同等的灵敏度，其Q因子仅为40。在本文中，结合谐波分析，我们用数字表明，达到的固有Q值高达6×10〜3。另外，值得一提的是，当确定HO腔的参数时，随着可移动PhC段沿公共轴移动，HO腔的谐振频率保持大致恒定。实际应用中的测量将更容易，更准确。

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  • 来源
    《Optical engineering》 |2011年第5期|p.054402.1-054402.6|共6页
  • 作者

    Daquan Yang; Huiping Tian; Yuefeng Ji;

  • 作者单位

    Beijing University of Posts and Telecommunications School of Information and Communication Engineering The Key Laboratory of Information Photonics and Optical Communications Ministry of Education Beijing 100876, China;

    Beijing University of Posts and Telecommunications School of Information and Communication Engineering The Key Laboratory of Information Photonics and Optical Communications Ministry of Education Beijing 100876, China;

    Beijing University of Posts and Telecommunications School of Information and Communication Engineering The Key Laboratory of Information Photonics and Optical Communications Ministry of Education Beijing 100876, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    microdisplacement sensor; slot photonic crystal; Q factor; nanocavity; sensitivity;

    机译：微位移传感器;缝隙光子晶体;Q因子纳米腔灵敏度;

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