Topological Magnetic Lattices for On-Chip Nanoparticle Trapping and Sorting

Area of Science:

• Photonics and Nanophotonics
• Topological Physics
• Materials Science

Background:

• On-chip optical lattices using surface plasmon polaritons (SPPs) offer nanoparticle manipulation capabilities.
• SPP systems are hindered by significant ohmic loss and heat generation due to metallic excitation.
• Need for alternative on-chip optical lattice platforms with improved performance and reduced thermal effects.

Purpose of the Study:

• To propose and investigate a novel magnetic topological lattice based on Bloch surface waves (BSWs).
• To demonstrate the advantages of BSWs over SPPs for on-chip optical applications.
• To explore the potential for dynamic manipulation and size-dependent sorting of nanoparticles.

Main Methods:

• Excitation of Bloch surface waves (BSWs) on transparent dielectric multilayers.
• Analysis of magnetic field and spin vector topologies within the BSW lattice.
• Demonstration of nanoparticle manipulation and sorting through lattice reconfiguration via polarization and phase adjustments.

Main Results:

• BSW-based magnetic topological lattices exhibit ultralong propagation ranges and reduced thermal effects compared to SPPs.
• Rich topological phenomena are observed in the magnetic field and spin vector.
• Feasible large-scale dynamic manipulation and size-dependent sorting of nanoparticles are achieved.

Conclusions:

• BSW-based magnetic topological lattices offer a promising alternative to SPP systems for on-chip applications.
• The proposed platform provides enhanced control over optical topologies and nanoparticle manipulation.
• Results offer new insights into magnetic field-governed optical topologies with potential applications in other wave systems.