Space-time wave packets in multimode optical fibers with controlled dynamic motions and tunable group velocities

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Фев. 27, 2025

Space-time wave packets (STWPs) with correlated spatial and frequency degrees of freedom exhibit time-dependent interference, thereby giving rise to interesting dynamic evolution behaviors. While versatile spatiotemporal phenomena have been demonstrated in freely propagating fields, coupling light into multimode fibers remains a fundamental experimental challenge. Whereas synthesizing STWPs typically relies on continuum plane-wave modes, their multimode-fiber counterparts must be constructed from the discrete set fiber modes whose propagation constants depend structures. Here, we demonstrate axially controllable motion transverse profile reconfigurable group velocity graded-index fibers. This is accomplished by introducing linear association between comb lines corresponding modes. The synthesized present rotation translation 4.8-ps period. Simultaneously, can tuned positive subluminal superluminal negative values (e.g., 0.870, 1.35, 10, –3.3 × 108 m/s, respectively). Su et al. ultra-fast pulses dynamically evolving profiles tunable velocities ranging values, achieved through space-time packets.

Язык: Английский

Perspective on tailoring longitudinal structured beam and its applications

Nanophotonics, Год журнала: 2025, Номер unknown

Опубликована: Апрель 18, 2025

Abstract Tailoring structured beams with varying lightwave properties along the longitudinal dimension has recently gained much interest. This paper gives a perspective on advances of longitudinally beams, their potential applications, and future opportunities.

Язык: Английский