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Copper nanorod array assisted silicon waveguide polarization beam splitter.

Sangsik Kim, Minghao Qi

|May 3, 2014

Summary

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We designed a 3D polarization beam splitter using copper nanorods. This device enables efficient splitting of light based on polarization (TE and TM modes) for integrated photonic circuits.

Area of Science:

Photonics and Nanotechnology
Integrated Optics
Plasmonics

Background:

Polarization beam splitters (PBS) are crucial components in integrated optics for manipulating light polarization.
Existing PBS technologies often face limitations in size, bandwidth, or material compatibility with semiconductor manufacturing.
The development of compact, broadband, and CMOS-compatible PBS is essential for advanced photonic integrated circuits.

Purpose of the Study:

To design a novel three-dimensional (3D) polarization beam splitter (PBS).
To leverage localized surface plasmon resonance (LSPR) for efficient polarization splitting.
To utilize copper nanorods for CMOS compatibility and enhanced performance.

Main Methods:

Designed a 3D structure incorporating a copper nanorod array between two silicon waveguides.

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Utilized the LSPR effect of copper nanorods to selectively couple transverse electric (TE) and transverse magnetic (TM) modes.

Engineered output waveguide ports to support specific polarization modes for enhanced extinction ratios.

Main Results:

Achieved selective cross-coupling of the TE mode to a coupler waveguide via LSPR.
Ensured the TM mode passed through the input waveguide without coupling.
Demonstrated an ultra-compact and broadband PBS performance, outperforming all-dielectric devices.

Conclusions:

The proposed copper nanorod-based PBS offers a compact and broadband solution for polarization splitting.
Copper's CMOS compatibility makes this design highly suitable for integration into semiconductor fabrication processes.
The device design enhances extinction ratios by optimizing output waveguide modes.