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基于光子晶体光学塔姆态的耦合分析,提出了一种含金属插层的折射率传感结构。对该光子晶体结构中光学塔姆态的形成机理进行了分析,并调整金属插层的厚度来实现两个光学塔姆态的耦合。建立缺陷峰波长与待测溶液折射率的关系模型,并分析其折射率传感特性。通过对光子晶体周期数和入射角度的讨论,可以得到,增加光子晶体周期数(或入射光的入射角度)可减小缺陷峰的半峰全宽(FWHM),从而提高传感器的灵敏度和折射率的分辨率。以乙二醇为待测样本,可得该传感器的灵敏度为445.45 nm/RIU(折射率单元),品质因数(Q值)可达1259.45。该传感器结构具有制备工艺简单和结构紧凑等优点,可为高Q值和高灵敏度折射率传感器的设计提供一定的理论参考。
Based on the coupling analysis of photonic crystal optical Tm, a refractive index sensing structure with metal intercalation is proposed. The formation mechanism of the optical Tm state in this photonic crystal structure is analyzed, and the thickness of the metal intercalation layer is adjusted to realize the coupling of two optical Tm states. A model of the relationship between the peak wavelength of the defect and the refractive index of the solution to be measured is established and its refractive index sensing characteristics are analyzed. Through the discussion of the number of photonic crystals and the incident angle, it can be found that increasing the number of photonic crystal cycles (or the incident angle of incident light) can reduce the full width at half maximum (FWHM) of the defect peak to improve the sensitivity and refractive index of the sensor Resolution. Using ethylene glycol as the sample to be tested, the sensitivity of the sensor is 445.45 nm / RIU (refractive index unit), and the quality factor (Q value) is 1259.45. The sensor structure has the advantages of simple preparation process and compact structure, and can provide certain theoretical reference for the design of a high-Q and high-sensitivity refractive index sensor.