Broadband waveguide intersection with low crosstalk in two-dimensional photonic crystal circuits by using topology...

Area of Science:

• Photonics
• Materials Science
• Waveguide Optics

Background:

• Photonic crystal slab waveguides are crucial for integrated optics.
• Efficiently routing light at intersections is a key challenge.
• Existing designs often suffer from signal loss and interference.

Purpose of the Study:

• To design novel waveguide intersections using topology optimization.
• To experimentally validate the performance of optimized photonic crystal slab structures.
• To achieve high-transmittance and low-crosstalk light routing.

Main Methods:

• Utilized topology optimization algorithms for intersection design.
• Fabricated optimized two-dimensional photonic crystal slab waveguides.
• Experimentally characterized light propagation through the optimized intersections.

Main Results:

• The topology-optimized intersection demonstrated high light transmittance.
• Low crosstalk was experimentally confirmed for the straightforward beam-propagation line.
• The optimized design effectively minimizes signal loss at waveguide junctions.

Conclusions:

• Topology optimization is an effective method for designing high-performance photonic crystal slab waveguide intersections.
• The validated designs offer a promising solution for integrated photonic circuits.
• This work advances the development of efficient light-routing components.