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Pseudo-parity-time symmetry in optical systems.
Xiaobing Luo1, Jiahao Huang2, Honghua Zhong2
1State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China and Department of Physics, Jinggangshan University, Ji'an 343009, China.
Physical Review Letters
|August 29, 2014
Summary
We introduce pseudo-parity-time (pseudo-PT) symmetry in modulated optical systems. Periodic modulation can induce PT symmetry in effective systems, enabling quasistationary propagation in non-PT symmetric original systems.
Area of Science:
- Photonics
- Quantum Mechanics
- Optical Systems
Background:
- Parity-time (PT) symmetry is a key concept in non-Hermitian physics.
- PT symmetry in optical systems allows for unique phenomena like unidirectional invisibility.
- Controlling PT symmetry in realistic, modulated systems remains a challenge.
Purpose of the Study:
- To introduce and define pseudo-parity-time (pseudo-PT) symmetry.
- To demonstrate the manipulation of PT symmetry in periodically modulated optical systems.
- To explore the implications of pseudo-PT symmetry for wave propagation.
Main Methods:
- Application of periodic modulation to optical systems with balanced gain and loss.
- Utilizing the high-frequency Floquet method to derive effective system properties.
- Analysis of wave propagation characteristics in modulated systems.
Main Results:
- Periodic modulation can induce PT symmetry in the effective system, regardless of the original system's PT symmetry.
- This induced PT symmetry leads to quasistationary propagation in non-PT symmetric original systems.
- The phenomenon is termed pseudo-PT symmetry, linking effective PT symmetry to original system properties.
Conclusions:
- Pseudo-PT symmetry offers a novel method for controlling PT symmetry in realistic optical systems.
- This approach provides a pathway to achieve quasistationary propagation.
- The findings have significant implications for designing advanced optical devices and controlling light propagation.
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