Giant enhancement of the transverse magneto-optical Kerr effect based on the Tamm plasmon polaritons and its application in sensing

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

“…5(b), the fitting of the resonance angle and refractive index data exhibits a clear linear dependence with a slope of 60, indicating that the designed structure has a high sensitivity of 601/refractive index unit (RIU) for gas detection. Although this value is of the same order of magnitude as that of the previously reported structures, 19,20 our new structure is much more straightforward to fabricate.…”

“…In this regard, Li exploited resonant tunneling in the magnetic dielectric layer between two metal layers of the same thickness to boost TMOKE for sensing applications. 18 Recently, Wu explored Tamm plasmon polaritons in multilayered systems consisting of alternating magnetic and nonmagnetic dielectric films that formed Bragg reflectors on Au mirrors, 19 and with magnetic films inserted between the Bragg reflectors and Au mirrors. 20 In this paper, we use a theoretical approach to propose an easy-to-fabricate structure consisting of hexagonal periodic nanopore CoFeB arrays on an anodic aluminum oxide layer supported by an alumina sheet (AAO/Al).…”

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

“…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. Using the general equation to fit the spectra at different refractive indices in Figure a enables the calculation of the line width L , where C 1 and C 2 are constants that characterize the background and total height of the peak, ρ determines the Fano shape, and θ peak and θ in are the angle corresponding to the TMOKE peak and the independent variable, respectively. ,,, After the fitting and calculation process, the corresponding FoM was plotted in Figure c, whose value is almost 1 order of magnitude larger than that of the reported all-dielectric structure comprising a magnetic grating and SiO 2 substrate, indicating that the proposed grooved nanostructure consisting of a single material is suitable for sensing applications.…”

“…The magneto-optical Kerr effect (MOKE) can display diverse responses concerning the direction of the magnetization, incident plane, and sample surface, and it mainly occurs in three different forms: longitudinal MOKE, polar MOKE with respect to the change in light polarization, and transverse MOKE (TMOKE), which evaluates the intensity change of the light in the reflected or transmitted directions. − Magneto-optical devices based on TMOKE have attracted considerable attention and have driven the advancement in the sensing of biomolecules, gases, , water, − butanol, and chloroform . The primary requirement for these applications is that the device must exhibit a detectable TMOKE signal.…”

Enhanced transverse magneto-optical Kerr effect using ferromagnetic metal perforated with nanopore arrays

“…Recently, interest has been given to T-MOKE defined as the change of the reflection or transmission when the direction of the applied magnetic field inverses from positive (negative) to negative (positive). Its spectrum can feature a Fano-like shape with a considerably higher magnitude and narrower linewidth at the resonance positions under the excitation of resonant optical modes, including propagating surface plasmon resonance (SPR), 9,10,[13][14][15][16] waveguide mode, 17,18 Fabry-Perot effect, 19 and optical Tamm mode, 20,21 by the suitable design of nanostructures compared to conventional ferromagnetic Co, Ni, and Fe materials. Among these modes, propagation modes (e.g., waveguide or propagating SPR modes) are more efficient because their wavevectors can be sensitively modified nonreciprocally by an external magnetic field, resulting in a considerable increase in T-MOKE.…”