抛物势中光学涡旋-反涡旋耦合波包的异常运动
Abnormal motions of optical vortex-antivortex-coupled wavepackets in the parabolic potential
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中文总结 AI 辅助
研究抛物势中光学涡旋-反涡旋耦合波包的异常运动。利用涡旋和反涡旋间固有耦合，通过考虑两种光学波形，理论和实验证明异常运动，揭示多种反直觉传播状态，可调整振荡频率，为相关研究和应用提供机会。
中文摘要 AI 辅助
抛物势中的（准）粒子或结构化波包呈现出众所周知的简谐振荡，通常由李萨如图形方程描述。然而，这种传统的谐波定律依赖于一个基本假设，即（准）粒子或波包的不同组成部分不相互作用。在此，我们通过利用不同成分之间的固有耦合——特别是利用嵌入空间结构化波包中的涡旋和反涡旋之间的非平凡耦合，对这一范式提出挑战。我们通过考虑两种不同的光学波形，在理论和实验上证明了异常运动。对于涡旋-反涡旋耦合偶极模式，我们揭示了反直觉的传播状态，包括偶极的周期性湮灭和再生、其非轨道运动以及在没有非线性的情况下实现临界平衡状态。对于在中心设置有反涡旋的涡旋圆形链，我们通过精确设计非局部涡旋-反涡旋耦合，成功地调整了势中整体构型的振荡频率，从而违背了经典的李萨如图形轨迹。由于简谐振荡已被证明是不同学科中的基本物理现象，并导致了许多重要应用，我们的演示通过利用抛物势中涡旋-反涡旋耦合波包的潜在异常运动，为引发大量研究和潜在应用提供了不同机会。
英文摘要
The (quasi)particles or structured wavepackets in parabolic potential exhibit well-known harmonic oscillations, typically described by the Lissajous equations. However, such conventional harmonic laws rely on a fundamental assumption that the different constituent components of the (quasi)particles or wavepackets do not interact. Here we challenge this paradigm, by taking advantage of intrinsic couplings among distinct constituents-specifically by leveraging nontrivial couplings between vortices and antivortices embedded in a spatially structured wavepacket. We demonstrate theoretically and experimentally abnormal motions by considering two different optical waveforms. For a vortex-antivortexcoupled dipole mode, we reveal counterintuitive propagation regimes, including periodic annihilation and regeneration of the dipole, its non-orbital motion and realization of a critical equilibrium state without nonlinearity. For a circular chain of vortices with an antivortex set at the center, we successfully tune the oscillation frequency of the overall configuration in the potential, thus disobeying the classical Lissajous trajectories, by precisely engineering the nonlocal vortex-antivortex couplings. Since the harmonic oscillations have been proven to be fundamental physical phenomena in distinct disciplines and led to numerous important applications, our demonstrations provide different opportunities to trigger considerable investigations and potential applications, by leveraging the underlying anomalous motions of the vortex-antivortex-coupled wavepackets in the parabolic potential.
