Congratulations for our new paper in sensors and actuators A
Magneto-plasmonic response of nickel nano-rings prepared by
electroless method
Akram Poursharif, Peyman Sahebsar, Seyyed Mahmood Monirvaghefi, Seyedeh Mehri Hamidi, Mahshid Kharaziha, Masih Bagheri
Over recent years, there has been increasing interest in the development of magneto-plasmonic nanostructures for advanced sensing applications, many of which have been produced using various lithography and sputtering deposition techniques. This research examines the magneto-plasmonic properties of nickel nano-rings with diameters between 200 and 600 nm, aimed at applications in sensing technologies. Nickel-silver-boron (Ni-Ag-B) nanoarrays were fabricated on ITO substrates through a combination of nano-sphere lithography and selective electroless deposition in a Ni-B and silver nanoparticle bath. Compared to conventional methods, this fabrication process is simpler, more cost-efficient, and produces durable coatings due to the formation of strong covalent bonds. Additionally, the electroless method generally leads to the formation of uniform coatings on complex surfaces. The distinct shape of the nano-rings enhances plasmonic effects by generating a highly concentrated electromagnetic field, outperforming other nanostructures. Unlike thin films, light reflectivity tests showed that the nano-rings exhibited surface plasmon resonance (SPR) in the 470-614 nm range at a 45° incident angle. In the next step, ellipsometry parameters were calculated. To further investigate the nano-rings’ effect, focus on the effective ellipsometry parameters. Additionally, Magneto-Optical Kerr Effect (MOKE) measurements revealed narrow Full Width at Half Maximum (FWHM) peaks at 512 nm and 560 nm, demonstrating their strong potential for highly sensitive detection compared to conventional SPR and ellipsometry-SPR. Finite element simulations using COMSOL further explored how magnetic fields influence the electromagnetic response of the nickel nano-rings, revealing promising applications in optical communication and sensing technologies.
