Plasmonic Field-Enhanced Zeeman Splitting in Ag-CsPbBr₃ Hybrid Nanostructures: A Step toward Tunable Magneto-Optical...

Area of Science:

• Materials Science
• Nanotechnology
• Optics

Background:

• Magneto-optical (MO) effects are crucial for advanced optical devices.
• Perovskite nanocrystals (NCs) offer unique optoelectronic properties.
• Plasmonic nanoparticles can enhance light-matter interactions.

Purpose of the Study:

• To investigate plasmon-enhanced magneto-optical effects in CsPbBr3 NCs coupled with Ag NPs.
• To explore the impact of nanoparticle arrangement on MO enhancement.
• To understand exciton-plasmon interactions in hybrid nanostructures.

Main Methods:

• Fabrication of hybrid nanostructures with varying Ag NP distributions (uniform, clustered, mixture).
• Characterization of magneto-optical properties, including Zeeman splitting and magnetic circular dichroism (MCD).
• Analysis of localized surface plasmon resonance (LSPR) effects on perovskite NCs.

Main Results:

• Significant enhancement of MO effects (Zeeman splitting, MCD) observed near perovskite band-edge transitions.
• Uniformly distributed Ag NPs yielded the highest MO enhancement due to optimal spectral and spatial overlap.
• Zeeman energy exhibited a linear dependence on magnetic field strength.

Conclusions:

• LSPR-driven field amplification effectively tunes spin-resolved optical transitions.
• Hybrid plasmonic-perovskite systems show great potential for MO sensing, spintronics, and quantum nanophononics.
• Spatial arrangement of nanoparticles is critical for maximizing MO enhancement.