Current control of light by nonreciprocal magnetoplasmonics

Abstract

The ability to actively control light has long been a major scientific and technological goal. We proposed a scheme that allows for active control of light by utilizing the nonreciprocal magnetoplasmonic effect. As a proof of concept, we applied current signal through an ultrathin metallic film in a magneto-plasmonic multilayer and found that dynamic photonic nonreciprocity appears in magnetic-optical material layer due to the magnetic field being induced from current signal and modulates surface plasmon polaritons trapped in the metal surface and the light reflected. The proposed concept provides a possible way for the active control of light and could find potential applications such as ultrafast optoelectronic signal processing for plasmonic nanocircuit technology and ultrafast/large-aperture free-space electro-optic modulation platform for wireless laser communication technology.

Magneto-optical heterostructures with second resonance of transverse magneto-optical Kerr effect

“…In this case, the magnetization vector is perpendicular to the SPP wave vector and parallel to the interface of the mediums. Presence of an external magnetic field causes that dielectric permittivity of magnetic materials becomes a tensor as follows 43 : where is permittivity and ig is proportional to magnetization. In this configuration no change in the polarization of the incident light is occurred however the reflected intensity is changed by the incident angle of p-polarized light.…”

Achieving a comparable transverse magneto-optical Kerr effect by spin-orbit field driven magnetoplasmonic

“…Considering the cross-sectional area of the Ta layer in our structure (4nm×20m), therefore, the corresponding electric current for this situation is ~70 mA. In Reference [16], which have only used the Orsted field of electric current (HCI), they reported that the average magnetic field in the ferromagnetic layer (Co) is about 2mT (20 Oe) when using HCI produced by the current of about 90mA injected into the gold layer in their investigated magnetoplasmonic structure. This value is matched well with dark line in Figure 2.…”

Magneto-optical surface plasmon resonances on perpendicular magnetic thin films consisting of CoPt/ZnO/Ag stacked nanolayers

“…[1][2][3] Large MO effects are desirable in practical applications such as information storage systems, telecommunication, and chemical and biological sensors. [12][13][14] The drastic MO response in Co/Au nanolayers substantially improves the signal-to-noise ratio, sensitivity, and detection limit of bio-chemical sensors. [14][15][16] In most of the previous studies, Au has been used as the plasmonic component of the MO-SPR sensors because of its low absorption loss and chemical stability.…”