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Efficient second harmonic generation in internal asymmetric plasmonic slot waveguide.

Tianye Huang, Patrick Moteng Tagne, Songnian Fu

|May 4, 2016

Summary

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We propose a new plasmonic waveguide for enhanced second harmonic generation (SHG). This internal asymmetric plasmonic slot waveguide (IAPSW) achieves a 24% conversion efficiency, showing promise for nonlinear optics applications.

Area of Science:

Photonics and Plasmonics
Nonlinear Optics
Materials Science

Background:

Plasmonic waveguides offer enhanced light confinement for nonlinear optical processes.
Achieving efficient second harmonic generation (SHG) requires careful phase matching and mode overlap.
Existing designs often face limitations in conversion efficiency and fabrication complexity.

Purpose of the Study:

To theoretically propose and analyze an internal asymmetric plasmonic slot waveguide (IAPSW) for efficient second harmonic generation (SHG).
To engineer the mode field distribution within the IAPSW to maximize the nonlinear coupling coefficient.
To investigate the impact of slot geometry and materials on SHG performance.

Main Methods:

Theoretical modeling of an IAPSW with two different materials in the slot region.

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Utilizing phase matching between the 0th-order fundamental mode and the 1st-order second harmonic mode.

Simulating and optimizing slot geometry and material composition for enhanced nonlinear coupling.

Predicting conversion efficiency based on waveguide length and material properties.

Main Results:

The proposed IAPSW enables efficient SHG at a 1.55 μm wavelength.
A conversion efficiency of 24% (1.8 × 10^5 W^-2 cm^-2 normalized) is predicted for an 11 μm long device.
Engineered mode field distribution significantly enhances the nonlinear coupling coefficient.
Thinner slot designs lead to more pronounced SHG efficiency.

Conclusions:

The IAPSW is a promising platform for high-efficiency nonlinear optical signal conversion.
The design allows for precise control over mode confinement and phase matching.
Further optimization of IAPSW structures could lead to even higher SHG efficiencies for integrated photonic devices.