Fe thicknesses dependence of attenuated total reflection response in magnetoplasmonic double dielectric structures: angular versus wavelength interrogation
Fe thicknesses dependence of attenuated total reflection response in magnetoplasmonic double dielectric structures: angular versus wavelength interrogation
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DOI：
10.7567/1347-4065/ab5205
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发表时间：
2019-11
影响因子：
1.5
通讯作者：
T. Kaihara;T. Shimodaira;Shogo Suzuki;A. Cebollada;G. Armelles;H. Shimizu
中科院分区：
文献类型：
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作者：
T. Kaihara;T. Shimodaira;Shogo Suzuki;A. Cebollada;G. Armelles;H. Shimizu
采用不同的沉积工艺制备了不同Fe厚度的Al_2O_3/SiO_2/Fe/Au结构。由于双层介质结构中表面等离子体激元的截止条件和磁光效应，反射率光谱具有极小值，其角度和波长位置可以被磁场调制。对于薄的Fe层，磁场主要调制角位置，而对于厚的Fe层，同时调制波长和角位置。所提出的结构及其与角度和波长的关系表明：(1)两种可选的询问模式是可行的：对于铁层较薄的结构，角度询问模式更合适，而厚铁层的波长询问模式更合适；(2)复杂空间中分析物的识别：实部的折射率漂移主要出现在角度询问中，而虚部的询问主要出现在波长询问中。
Al2O3/SiO2/Fe/Au structures with different Fe thicknesses were fabricated using different deposition techniques. Due to the cutoff condition of surface plasmon polaritons in the double-layer dielectric structure and magneto-optical effect, the reflectivity spectra show a minimum and its angular and wavelength positions can be modulated by the magnetic field. For thin Fe layers, the magnetic field modulates mainly the angular position, whereas for thick Fe layers both wavelength and angular positions are modulated. The proposed structure and the angular and wavelength dependence suggest two feasibilities of (1) two selectable interrogation modes: whereas for structures with thin Fe layers angular interrogation mode is preferred, with thick Fe layers wavelength interrogation mode is more appropriate, and (2) discrimination of analyte in the complex space: the refractive shift in the real part would dominantly appear in the angular interrogation, while the imaginary part in the wavelength interrogation.