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Planar photonic crystal structure with inherently single-mode waveguides
Alejandro Martinez1, Jaime Garcia, Guillermo Sanchez
1Fibre-Radio Group, ITACA Research Institute, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain. almarab@upvnet.upv.es
Summary
This study introduces a novel planar photonic crystal waveguide. The design achieves single-mode operation and overcomes drawbacks of existing structures.
Area of Science:
- Photonics
- Materials Science
- Optical Engineering
Background:
- Conventional planar photonic crystal waveguides face challenges.
- Existing designs often suffer from drawbacks limiting performance.
- Need for improved single-mode waveguide structures in planar photonic crystals.
Purpose of the Study:
- To propose and discuss a novel planar photonic crystal waveguide.
- To achieve inherently gap-guided single-mode operation.
- To overcome limitations of existing photonic crystal waveguide designs.
Main Methods:
- A two-dimensional lattice of silicon rods on a silica slab, clad by lower refractive index silica.
- Optimization of physical parameters (rod radius, core thickness) for odd mode bandgap maximization.
- Reduction of rod radius to achieve lossless guided modes within the bandgap and below the light cone.
Main Results:
- Demonstration of a novel planar photonic crystal structure for single-mode waveguides.
- Achieved lossless guided modes within the bandgap and below the cladding light cone.
- Bandwidth enhancement possible by incorporating a thin silicon dielectric waveguide.
Conclusions:
- The proposed planar photonic crystal waveguide offers inherent gap-guided single-mode operation.
- The design addresses and potentially overcomes common drawbacks of conventional photonic crystal waveguides.
- This approach presents a promising solution for advanced optical integrated circuits.