Abstract
The ability of plasmonic structures to confine and enhance light at nanometer length scales has been traditionally exploited to boost the magneto-optical effects in magneto-plasmonic structures. These platforms allows for light control via externally applied magnetic fields, which is of prime importance for sensing, data storage, optical-isolation, and telecommunications applications. However, applications are hindered by the high-level of ohmic losses associated to metallic and ferromagnetic components. Here, we use a lossless all-dielectric platform for giant enhancement of the magneto-optical effects. Our structure consists of a high-refractive index dielectric film on top of a magnetic dielectric substrate. We numerically demonstrate an extraordinarily enhanced transverse magneto-optical Kerr effect due to the Fabry–Perot resonances supported by the high-refractive index slab. Potential applications for sensing and biosensing are also illustrated in this work.
Highlights
The transverse MO Kerr effect (TMOKE) has emerged as a promising approach for improved biosensing [16,18], optical filtering [17], and magnetization monitoring [14,15]. Many of these applications are challenged by extremely weak TMOKE signals in ferromagnetic metals (~10−3 ) [24]
Despite our earlier efforts on this topic [25,26], where we introduced the use of ε-near-zero materials, for giant enhancement of the TMOKE without the need to use prisms or grating couplers, applications are still challenged by optical losses associated with the presence of ferromagnetic metals
We theoretically demonstrated a novel dielectric structure for lossless giant enhancement of the transverse magneto-optical Kerr effect
Summary
Owing to several potential applications in biosensing, optical isolation, mapping of microwave currents, and ultrafast optical data storage devices, magneto-optical (MO) effects have become a subject of considerable theoretical and experimental interest for many research groups [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. Many of these applications are challenged by extremely weak TMOKE signals in ferromagnetic metals (~10−3 ) [24] This limitation is traditionally beaten through the magnetoplasmonic effect, i.e., the combination of MO and plasmonic effects [1,2,3,4,5,6,7]. Despite our earlier efforts on this topic [25,26], where we introduced the use of ε-near-zero materials, for giant enhancement of the TMOKE without the need to use prisms or grating couplers, applications are still challenged by optical losses associated with the presence of ferromagnetic metals. III-V or Si-based semiconductors, which allows for on-chip MO applications [27,28,29]
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