论文部分内容阅读
结合光子晶体的缺陷模式和表面模式特性,提出了一种含吸收介质的光子晶体法布里-珀罗异质结构。该结构由周期性光子晶体、待测样本和外部空气层共同组成,将待测样本直接作为表面缺陷腔。基于光学谐振原理和表面波理论,分析了所提结构的折射率传感机理。讨论了不同吸收介质对所提结构光谱特性的影响。将石墨烯作为吸收介质时,传感结构的品质因子(Q值)明显高于将硫化锌、氧化铝和金属银作为吸收介质的情况;将样本层作为表面缺陷腔,通过光学Tamm态谐振,可实现多次全反射衰荡,使谐振光信号和待测样本充分作用,从而提高了该结构的传感灵敏度。所提结构的Q值为2097.18,灵敏度为1017.98nm/RIU。研究结果对实现待测物的高Q值和高灵敏度检测具有一定的理论参考价值。
A photonic crystal Fabry-Perot heterostructure containing absorption media is proposed based on the defect modes and surface mode properties of photonic crystals. The structure consists of a periodic photonic crystal, a sample to be measured and an external air layer, and the sample to be tested is directly used as a surface defect cavity. Based on the principle of optical resonance and surface wave theory, the refractive index sensing mechanism of the proposed structure is analyzed. The influence of different absorption media on the spectral properties of the proposed structure was discussed. When graphene is used as the absorbing medium, the quality factor (Q) of the sensing structure is obviously higher than that of zinc sulfide, aluminum oxide and metallic silver as the absorbing medium. By taking the sample layer as the surface defect cavity and resonating through the optical Tamm state, Can realize multiple total reflection ring down, make the resonant optical signal and the sample to be tested fully, so as to improve the sensing sensitivity of the structure. The proposed structure has a Q of 2097.18 and a sensitivity of 1017.98 nm / RIU. The research results have some theoretical reference value for the high Q value and high sensitivity detection of the test object.