Fabry–Perot interference enhanced transverse magneto-optical Kerr effect in Ce:YIG nanopore array on an anodic aluminum oxide template

Abstract

The all-dielectric magneto-optical (MO) structure has garnered considerable interest due to its enhanced MO effect and low ohmic loss compared to the magnetoplasmonic structure. In this study, the effect of Fabry–Perot (F–P) interference on the enhancement of the transverse magneto-optical Kerr effect (T-MOKE) as well as sensing performance is theoretically investigated in a dielectric MO structure composed of cerium-substituted yttrium iron garnet (Ce:YIG) nanopore array coating an anodic aluminum oxide film standing on an aluminum sheet referred to as the AAO/Al template. The system is particularly interesting because the MO response is significantly enhanced in the position of the F–P interference, in which the T-MOKE signal is close to a 5-fold increase compared with the reference Ce:YIG film. Additionally, the sensing performance shows that the all-dielectric nanopore-based system proposed here provides an alternative to fabricating gas and solution detectors with low ohmic loss

Observation of Enhanced Faraday Effect in Eu-Doped Ce:YIG Thin Films

“…Numerous initiatives, including Bi/Ce doping, [8][9][10][11][12][13] surface structure modification, [14][15][16][17] modulation coherence, [18] and silicon-based integrated devices, [19,20] have been devoted to address these issues. Bi:YIG has attained the largest 𝜃F in a visible range (2 × 10 5 deg/cm @525 nm), [9,21] although 𝜃F in near-infrared is only ∼ −3 × 10 3 deg/cm.…”

Ferromagnetic Subwavelength Periodic Nanogroove Structure with High Magneto-Optical Kerr Effect for Sensing Applications

“…Here, the sensitivity was derived to be as high as 112.2 deg/RIU by first tracing the angle of incidence at the peak position of the TMOKE signal (black dots) for each refractive index and then performing a linear fit to the resulting data to obtain the slope of the line (red line), as shown in Figure b. In contrast, the reported sensitivities of complex magneto-optical structures with multiple alternating layers and all-dielectric magneto-optical structures are less than 100 deg/RIU, whereas the sensitivity of the proposed structure is almost 1 order of magnitude higher than that of the reported structures with complicated fabrication processes. Additionally, a large FoM, describing the ratio of the sensitivity S to the line width L , indicating a narrower linewidth and strong local electromagnetic field enhancement, is extremely valuable for effective detection with a sensor.…”

Transverse magneto-optical behavior of nanoporous ferromagnetic film based on anodic aluminum oxide/aluminum template and its sensing application

“…TMOKE shows the reflectance responses, corresponding to the opposite directions of the magnetic field 23 Here, R H+ and R H− respectively stand for the reflectances of p -polarized light in opposite directions of the magnetic field. The quantity R H0 denotes the reflectance without magnetization.…”