Ignatyeva Daria, Kapralov Pavel, Golovko Polina, Shilina Polina, Khramova Anastasiya, Sekatskii Sergey, Nur-E-Alam Mohammad, Alameh Kamal, Vasiliev Mikhail, Kalish Andrey, Belotelov Vladimir
Russian Quantum Center, 121205 Moscow, Russia.
Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.
Sensors (Basel). 2021 Mar 11;21(6):1984. doi: 10.3390/s21061984.
We propose an all-dielectric magneto-photonic crystal with a hybrid magneto-optical response that allows for the simultaneous measurements of the surface and bulk refractive index of the analyzed substance. The approach is based on two different spectral features of the magneto-optical response corresponding to the resonances in p- and s-polarizations of the incident light. Angular spectra of p-polarized light have a step-like behavior near the total internal reflection angle which position is sensitive to the bulk refractive index. S-polarized light excites the TE-polarized optical Tamm surface mode localized in a submicron region near the photonic crystal surface and is sensitive to the refractive index of the near-surface analyte. We propose to measure a hybrid magneto-optical intensity modulation of p-polarized light obtained by switching the magnetic field between the transverse and polar configurations. The transversal component of the external magnetic field is responsible for the magneto-optical resonance near total internal reflection conditions, and the polar component reveals the resonance of the Tamm surface mode. Therefore, both surface- and bulk-associated features are present in the magneto-optical spectra of the p-polarized light.
我们提出了一种具有混合磁光响应的全介质磁光子晶体，它能够同时测量被分析物质的表面和体折射率。该方法基于磁光响应的两种不同光谱特征，它们分别对应于入射光p偏振和s偏振中的共振。p偏振光的角谱在全内反射角附近呈现阶梯状行为，其位置对体折射率敏感。s偏振光激发局域在光子晶体表面附近亚微米区域的TE偏振光学塔姆表面模式，并且对近表面分析物的折射率敏感。我们建议测量通过在横向和纵向配置之间切换磁场而获得的p偏振光的混合磁光强度调制。外部磁场的横向分量负责全内反射条件下的磁光共振，而纵向分量则揭示了塔姆表面模式的共振。因此，p偏振光的磁光谱中同时存在与表面和体相关的特征。
