Abstract
Metallic nanostructures supporting Localized Surface Plasmon Resonances (LSPR) are characterized by their unique ability to control and manipulate light at the nanoscale. Noble metal nanostructures, such as gold nanostructures, are demonstrating to exhibit magneto-optic activity in the presence of modulated magnetic field of low intensity in transversal configuration (T-MOKE). Validation of experimental findings was achieved by numerical simulations based on Finite Element Method (FEM) techniques. The developed numerical models allowed studying the combination of the T-MOKE effect with the localized surface plasmon resonance of metal nanoparticles. Numerical optical and magneto-optical spectra provided a deep insight on the physical aspects behind the magneto-optical activity of metal nanostructures strictly related to direction of oscillations electrical dipoles generated in resonance conditions. Additionally the MO signal was characterized as a transducing signal for refractive index sensing in liquid conditions. The outcome is an increase in the limit of detection of magneto optical transducer with respect to traditional plasmonic sensors. A new strategy for magneto-plasmonic sensing based on the use of glass supported -Au nanostructures based on their MO properties has put forward.
Highlights
Metallic nanostructures supporting Localized Surface Plasmon Resonances (LSPR) are characterized by their unique ability to control and manipulate light at the nanoscale
The sequence of images evidences the morphological evolution of the Au nanoparticles coverage due to the increase of the annealing time: after 1 minute, well developed nanoparticles form on the glass substrate and, as the annealing process proceeds, neighbouring nanoparticles tend to coalesce whereas isolated nanoparticles shrink, resulting in an average reduction of their diameter and in a likely increase of their height
We demonstrate here that a low intensity modulated magnetic field can be suitable to torque the oscillating electrical dipoles (Fig. 6) of noble metal NPs, generating a detectable MO effect in T-MOKE configuration
Summary
Metallic nanostructures supporting Localized Surface Plasmon Resonances (LSPR) are characterized by their unique ability to control and manipulate light at the nanoscale Noble metal nanostructures, such as gold nanostructures, are demonstrating to exhibit magneto-optic activity in the presence of modulated magnetic field of low intensity in transversal configuration (T-MOKE). Pineider et al, demonstrated the existence magneto-plasmonic modes in gold nanoparticles dispersed in liquid solvents by magnetic circular dichroism (MCD) measurements[9] In this last case the authors attempted to use the effect for refractometric sensing by changing the refractive index of the solution. To the best of our knowledge, no experimental results are reported on T-MOKE characterization of glass supported -Au nanostructures, in particular when excited in Kretschmann configuration This choice presents the practical advantage to pursuit a better signal-to-noise ratio, an essential requirements for high resolution sensing signals. It is ideal for real time sensing applications, avoiding troubling interferences of light beam with analytes and buffer water solutions
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