Enhanced magneto-optical effect in three layer based magnetoplasmonic structures

Abstract

In this article we introduce a magnetoplasmonics (MP) planar nanostructure with enhanced transverse magneto-optical (MO) activity. For this goal MO characteristics of magneto-structures comprising both metal layer and linear array of (metal) nanorods are analyzed. We explore three types of structures with nanorods and compare their features based on transvers magneto-optical Kerr effect (TMOKE) with the corresponding one for conventional three layers MO structure. Comparison between the values of TMOKE signals in two structures (proposed and conventional)shows more than one order of magnitude improvement. Due to this feature the refractive index sensitivity of the offered structures, specially with one and three types of Au nanorod arrays,

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

“…( 20 ), of proposed heterostructures and different MO structures reported in literatures. Structures Au(3 nm)/Co(2 nm)/Ag(3 nm)/Co(2 nm)/Au(3 nm) 632.8 221.78 Au(3 nm)/NiFe(2 nm)/Ag(3 nm)/Co(2 nm)/Au(3 nm) 632.8 154.19 Au(3 nm)/Co(2 nm)/Ag(3 nm)/ /Ag(3 nm)/Co(2 nm)/Au(3 nm) 632.8 157.28 Cr(2 nm)/Au(39.6 nm)/Co(2 nm)/Au(17.8 nm) 57 633 0.7 Cr(2 nm)/Au(25.3 nm)/Co(4.3 nm)/Au(28 nm) 57 633 0.62 Cr(2 nm)/Au(38.1 nm)/Co(2 nm)/Au(17.1 nm) 57 850 4.47 Cr(2 nm)/Au(27.2 nm)/Co(3.9 nm)/Au(28.8 nm) 57 850 3.81 Au(15 nm)/Co(2 nm) 39 660 0.2 Au/Co/ single type of Au nanorod 58 653 33.313 Au/Co/ two types of Au nanorods 58 653 2.491 Au/Co/ three types of Au nanorods 58 653 11.847 …”

Extreme Nonreciprocity in Metasurfaces Based on Bound States in the Continuum

“…[6] Nevertheless, MO effects are very weak in the optical regime [7] and must be enhanced with proper techniques for designing compact nonreciprocal devices. Recently, there have been multiple techniques suggested to achieve an enhancement of MO effects in a subwavelength structure: magnetophotonic crystals, [8][9][10][11] coupled surface-plasmon polaritons, [12][13][14] magnetic Weyl semimetals, [15] multiple layer systems, [16] and resonant all-dielectric metasurfaces. [17][18][19][20][21] Although these studies achieve a high enhancement, the resonant properties of the structures considered do not allow ultra-high quality factors that would enable higher interaction times between light and the MO material.…”

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

“…6 However, these applications are limited for further exploitation due to the extremely lowintensity TMOKE signals. To a certain extent, this limitation can be addressed by the confinement of the electromagnetic energy at the nanoscale, which allows for a significant enhancement of the electromagnetic field owing to the realization of the surface plasmon resonance (SPR) using prism-based metal/ magnetic multilayers [7][8][9] and structures comprising plasmonic gratings and magnetic materials. [10][11][12] However, with the development of microfluidic sensing devices, the high volume of prismatic couplers required for SPR excitation has prevented the multiplexing, miniaturization, high flux, integrability, and portability required for lightweight sensing instruments.…”