Enhanced magnetic response in a gold nanowire pair array through coupling with Bloch surface waves

Area of Science:

• Photonics and Plasmonics
• Condensed Matter Physics
• Nanophotonics

Background:

• Magnetic plasmon polaritons (MPPs) are crucial for light confinement.
• Bloch surface waves (BSWs) offer unique light-matter interaction properties.
• Coupling MPPs and BSWs can lead to novel optical phenomena.

Purpose of the Study:

• To investigate the coupling between MPPs and BSWs in a gold nanowire pair array on a periodic dielectric multilayer.
• To explore the enhancement of magnetic field intensity through this coupling.
• To assess the potential for applications in nonlinear optics and spectroscopy.

Main Methods:

• Numerical simulations were employed to study the system.
• The study focused on a one-dimensional gold nanowire pair array.
• The array was positioned on a periodic dielectric multilayer structure.

Main Results:

• Maximum coupling between MPPs and BSWs was observed at an optimal dielectric multilayer period.
• A Rabi-type splitting of up to 125 meV was achieved in the hybridized MPPs.
• Maximal magnetic field intensity was significantly enhanced (>1.5x) compared to arrays on a substrate.

Conclusions:

• The coupling of MPPs and BSWs in this system enables strong light-matter interactions.
• The observed Rabi splitting and magnetic field enhancement are promising for advanced optical applications.
• This research opens avenues for enhanced nonlinear optical effects and near-field spectroscopy.