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Multi-topological state via the Brillouin zone overlap for nonlinear frequency conversion
Optics Letters
|November 1, 2023
Summary
Researchers developed a novel method for enhanced topological nonlinear frequency conversion using multiband topological states. This approach overcomes experimental limitations by combining Brillouin zones, enabling efficient higher harmonic generation.
Area of Science:
- Photonics
- Condensed Matter Physics
- Nonlinear Optics
Background:
- Topological edge states (TESs) and topological corner states (TCSs) in photonic crystals offer pathways for manipulating nonlinear frequency conversions.
- Experimental realization of topological nonlinear frequency conversion and higher harmonic generation is challenging due to design complexity and limited multiband properties.
Purpose of the Study:
- To propose an effective method for achieving multiple TESs and TCSs.
- To enable topological nonlinear frequency conversion and higher harmonic generation with enhanced efficiency and control.
Main Methods:
- Combining Brillouin zones from multiple distinct systems to create new topological states.
- Utilizing inter-system hopping to disperse subsystem spectra into different energy levels.
- Constructing a topological photonic crystal based on the Brillouin zone overlapped SSH model.
Main Results:
- Demonstration of multiple TESs and TCSs through the proposed method.
- Spectra of subsystems disperse into distinct energy levels due to inter-system hopping.
- Overlapped TCSs successfully participate in nonlinear frequency conversion.
Conclusions:
- The proposed scheme provides a significant pathway for realizing topological nonlinear frequency conversion.
- The method allows for double or multiple resonances, enhancing conversion efficiency.
- This approach offers a more feasible route for experimental implementation of topological nonlinear optics.
