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Efficient Mode Transfer on a Compact Silicon Chip by Encircling Moving Exceptional Points.
Qingjie Liu1, Shuyi Li1, Bing Wang1
1School of Physics and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China.
Physical Review Letters
|May 2, 2020
Summary
Moving exceptional points (EPs) in non-Hermitian systems enable adiabatic mode transfer with shorter optical waveguides and improved efficiency. This breakthrough offers potential for compact, high-performance optical switches and convertors.
Area of Science:
- Non-Hermitian physics
- Singularities in complex systems
- Optical waveguide engineering
Background:
- Exceptional points (EPs) are singularities in non-Hermitian systems, enabling asymmetric mode transfer via adiabatic encircling.
- Previous methods required long optical waveguides for adiabatic evolution, limiting device integration.
Purpose of the Study:
- To demonstrate adiabatic parameter changes along smaller encircling loops using moving EPs.
- To significantly shorten optical structures for mode transfer applications.
- To improve mode transmittance and transfer efficiency.
Main Methods:
- Utilizing moving exceptional points (EPs) in lossy optical waveguides.
- Adiabatically changing system parameters along a smaller encircling loop.
- Analyzing mode transfer dynamics and efficiency.
Main Results:
- Significant shortening of optical structures compared to fixed EPs.
- Remarkable improvement in mode transmittance.
- Sustained high transfer efficiency of approximately 90%.
Conclusions:
- Moving EPs allow for adiabatic evolution in more compact waveguide structures.
- This advancement enhances mode transfer efficiency and device performance.
- Moving EPs show promise for integrated broadband optical switches and convertors at telecommunication wavelengths.
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