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Shape unrestricted topological corner state based on Kekulé modulation and enhanced nonlinear harmonic generation.
Kai Guo1,2, Huiyuan Wang1, Jiawei Xiong1
1School of Computer and Information, Hefei University of Technology, Hefei 230009, China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
Researchers developed shape-unrestricted topological corner states for enhanced nonlinear harmonic generation. This breakthrough overcomes previous symmetry limitations, offering robust and flexible photonic integrated devices.
Area of Science:
- Photonics
- Condensed Matter Physics
- Nonlinear Optics
Background:
- Topological corner states offer high Q-factor and robustness for nanocavities.
- Previous applications were limited by strict lattice symmetry requirements.
Purpose of the Study:
- To design a photonic nanocavity with shape-unrestricted topological corner states.
- To enhance nonlinear harmonic generation (SHG and THG) using these novel states.
Main Methods:
- Applying Kekulé modulation to a honeycomb photonic crystal.
- Exciting topological corner states with arbitrary shapes and high Q-factor.
- Demonstrating enhanced second and third harmonic generation.
Main Results:
- Achieved shape-unrestricted topological corner states, liberating boundaries from specific lattice directions.
- Demonstrated enhanced SHG and THG, independent of corner geometry.
- Showcased robustness of corner states and nonlinear harmonic generation to lattice defects.
Conclusions:
- Shape-unrestricted topological corner states provide flexibility for nonlinear optical processes.
- This approach enhances nonlinear harmonic generation and offers robustness.
- Potential for advancing photonic integrated devices and other nonlinear optical applications.
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