1 × 3 ultra-wideband photonic crystal waveguide power splitter designed by the downhill simplex algorithm

Area of Science:

• Photonics
• Optical Engineering
• Materials Science

Background:

• Photonic crystal waveguides offer unique light manipulation properties.
• Efficient beam splitting is crucial for optical communication systems.
• Designing complex photonic devices requires advanced optimization techniques.

Purpose of the Study:

• To propose and design an ultra-wideband 1x3 beam splitter using a two-dimensional photonic crystal waveguide.
• To achieve flexible control over beam splitting ratios.
• To optimize the device for high performance and efficiency.

Main Methods:

• Utilizing a two-dimensional photonic crystal waveguide structure.
• Employing the downhill simplex optimization algorithm for inverse design.
• Optimizing the radii and offsets of six control dielectric rods.

Main Results:

• Successfully designed ultra-wideband 1x3 photonic crystal beam splitters.
• Achieved various splitting ratios, including equal-power, unequal-power, and large-splitting-ratio configurations.
• Demonstrated an operating bandwidth exceeding 70 nm and a total transmission rate over 96%.

Conclusions:

• The designed photonic crystal beam splitter exhibits wide operating bandwidth and high transmission efficiency.
• The device shows significant potential for applications in all-optical communication networks.
• This work contributes to advancements in high-density photonic integration.