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Traveling waves in two parallel infinite linear point-scatterer arrays.
Ioannis Chremmos1, George Fikioris
1School of Electrical and Computer Engineering, National Technical University of Athens, Zografos 15773, Athens, Greece. jochremm@central.ntua.gr
Summary
This study analyzes traveling waves in coupled point-scatterer arrays, revealing slow supermodes due to coupling. These findings offer insights for designing optical couplers using nanoparticle chains.
Area of Science:
- Physics
- Nanophotonics
- Wave phenomena
Background:
- Coupled systems exhibit unique wave behaviors.
- Point-scatterer arrays are fundamental structures in wave physics.
- Optical couplers are essential components in photonic integrated circuits.
Purpose of the Study:
- To analytically investigate traveling waves in two coupled parallel infinite linear point-scatterer arrays.
- To explore the formation of supermodes resulting from array coupling.
- To examine the influence of axial offset on wave propagation.
Main Methods:
- Analytical treatment of traveling waves in coupled infinite linear point-scatterer arrays.
- Numerical investigation of mode splitting, dispersion curves, and coupling length.
- Parametric study considering inter-element spacing, inter-array distance, and axial offset.
Main Results:
- Discovery of slow quasi-even/odd supermodes arising from coupling-induced mode splitting.
- Observation of exactly even/odd supermodes at zero axial offset.
- Detailed numerical analysis of mode characteristics versus geometric parameters.
Conclusions:
- Coupled point-scatterer arrays support novel supermodes analogous to optical waveguide couplers.
- Axial offset significantly influences supermode properties.
- The findings have potential applications in developing directional optical couplers using nanoparticle chains.
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