Nanophotonic devices based on magneto-optical materials: recent developments and applications

Abstract

Interaction between light and magnetism in magneto-optical (MO) nanophotonic devices has been actively studied in the past few years. The recent development of MO all-dielectric resonators and metasurfaces has led to the emergence of various novel MO phenomena that were not observed in their bulk counterparts. For example, a large s-polarized transverse MO Kerr effect can be observed at magnetic resonance wavelength, which cannot exist in the bare MO films. We review recent developments in nanophotonic devices based on MO materials and focus on different modes and related MO effects in nanophotonic structures with emphasis on recently discovered new MO phenomena in magnetoplasmonics and all-dielectric nanostructures, such as dark mode, all-dielectric Mie resonance and waveguide mode. Further, we discuss the potential applications of these nanostructures for biological/chemical sensing, magnetic field sensing, and magnetic field-controlled active and nonreciprocal metasurfaces.

Modeling of Enhanced Polar Magneto-Optic Kerr Effect by Surface Plasmons in Au Bowtie Arrays

“…Therefore, improving the observation accuracy of magneto-optical Kerr is still an important issue [ 10 ]. Magneto-optic surface plasmon resonance (MOSPR) can be controlled by external magnetic fields, overcoming this limitation [ 11 , 12 ]. Early MOSPR investigations concentrated on a few flat, pure ferromagnetic films, and to improve the MO effects, surface plasmon resonance (SPR) was activated on the surface of these films [ 13 , 14 , 15 ].…”

Optical fiber-based probe for detection of magnetic field

“…Today, there are several commercially successful types of sensors available on the market that can respond to the presence of a magnetic field and measure its strength or possible changes. These sensors are mainly based on magnetoelectric or magnetooptical phenomena [1][2][3][4] . We often measure magnetic flux density or intensity indirectly based on another phenomenon that takes place in the sensor itself.…”

A transparent room-temperature ferromagnetic semiconductor on glass: anatase Co-doped TiO2 oriented thin films with improved electrical conduction

“…[10][11][12] Because its ferromagnetism can be probed electrically and optically via the anomalous Hall effect (AHE) and magnetooptical (MO) effect, respectively, [13][14][15][16] spintronic applications, such as spin transistors, nonvolatile memory, and magnetooptical sensors are expected. [17][18][19][20][21][22][23][24] In most of the previous studies, Ti 1−x Co x O 2−δ was grown in the form of epitaxial thin films to overcome the thermodynamical solubility limit of ∼2 at% for Co 2+ ions in the TiO 2 lattice. 25,26 Among the polymorphs of Ti 1−x Co x O 2−δ , the most stable rutile and metastable anatase structures have been mainly studied, where the latter is suitable for electrical control of ferromagnetism due to higher electron mobility.…”