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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Omnidirectional optical attractor in structured gap-surface plasmon waveguide.

Chong Sheng¹, Hui Liu¹, Shining Zhu¹

¹National Laboratory of Solid State Microstructures &School of Physics, Collaborative Innovation Center of Advanced Microstructures, National Center of Microstructures and Quantum Manipulation, Nanjing University, Nanjing 210093, China.

Scientific Reports

|March 23, 2016

Summary

This summary is machine-generated.

Researchers developed a structured metal-dielectric-metal waveguide for optical attractors. This system enables efficient, broad-spectrum, omnidirectional absorption of gap-surface plasmon polaritons (GSPPs) with deep sub-wavelength focusing.

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Area of Science:

Photonics and Plasmonics
Nanophotonics
Waveguide Optics

Background:

Structured metal-dielectric-metal (SMDM) waveguides offer unique optical properties.
Gap-surface plasmon polaritons (GSPPs) are crucial for nanoscale light manipulation.
Controlling light absorption and focusing at the nanoscale is a key challenge.

Purpose of the Study:

To propose and investigate an optical attractor using a novel SMDM waveguide.
To demonstrate adiabatic nano-focusing of GSPPs.
To achieve omnidirectional absorption across a broad spectral range.

Main Methods:

Fabrication of a structured waveguide with variable thickness near a microsphere.
Application of geometrical optics approximation for ray trajectory analysis.
Validation through full-wave numerical simulations.

Main Results:

Demonstration of adiabatic, deep sub-wavelength focusing of GSPPs.
Observation of high local field enhancement.
Confirmation of omnidirectional absorption over a broad spectrum.

Conclusions:

The proposed SMDM waveguide effectively functions as an optical attractor.
The system enables reflection-free, omnidirectional absorption of GSPPs.
This technology is suitable for optical and infrared applications requiring efficient light absorption and focusing.