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Optimizing substrate-mediated plasmon coupling toward high-performance plasmonic nanowire waveguides.

Shunping Zhang¹, Hongxing Xu

¹Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Box 603-146, Beijing 100190, China.

|August 16, 2012

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Researchers explored surface plasmon polaritons in metallic nanowire over substrate (NWOS) waveguides. Adding a high-permittivity layer improves waveguiding performance for nanophotonic circuits.

Area of Science:

Photonics
Materials Science
Nanotechnology

Background:

Minimizing photonic circuits to the nanometer scale requires advanced plasmonic waveguides.
Surface plasmon polaritons (SPPs) are key for nanoscale light manipulation.

Purpose of the Study:

To theoretically investigate the properties of SPPs in a metallic nanowire over substrate (NWOS) configuration.
To identify conditions for efficient subwavelength plasmonic waveguiding.

Main Methods:

Theoretical study of SPP properties in NWOS configurations.
Analysis of the influence of dielectric substrates with varying permittivity.
Simulation of a modified NWOS structure with an added high-permittivity layer.

Main Results:

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The dielectric substrate breaks symmetry, mediating plasmon coupling.
Subwavelength waveguiding is feasible in thin NWOS with low-permittivity substrates at shorter wavelengths.
High-permittivity substrates increase propagation losses due to leaky radiation.
Adding a high-permittivity layer to a low-permittivity substrate blocks leaky radiation, enabling near-infrared waveguiding.

Conclusions:

The NWOS configuration offers a pathway to high-performance plasmonic waveguiding.
This approach is compatible with silicon technologies for deep subwavelength devices like modulators.