The orbital angular momentum of light (OAM) is the component of angular momentum of a light beam that is dependent on the field spatial distribution, and not on the polarization. OAM can be split into two types. The internal OAM is an origin-independent angular momentum of a light beam that can be associated with a helical or twisted wavefront.

2019年10月2日 · Hitherto, owing to these salient properties and optical manipulation technologies, tunable vortex beams have engendered tremendous advanced applications such as optical tweezers, high-order quantum...

2022年5月20日 · Light possesses angular momentum, in two flavours. One is spin, which is associated with circular polarization, a phenomenon that has been recognized for 200 years. The other is orbital angular...

2024年8月26日 · In light of the pivotal contributions to the field of OAM and its interactions with scattering media, the current study integrates and builds upon foundational research that explores the...

2025年1月10日 · Achieving highly tailored control over both the spatial and temporal evolution of light’s orbital angular momentum (OAM) on ultrafast timescales remains a critical challenge in photonics. Here, we introduce a method to modulate the OAM of light on a femtosecond scale by engineering a space-time coupling in ultrashort pulses.

There are two particularly important ways in which a light beam can rotate: if every polarization vector rotates, the light has spin; if the phase structure rotates, the light has orbital angular momentum (OAM), which can be many times greater than the spin.

2024年12月17日 · This paper proposes a method utilizing stimulated Raman scattering to detect the magnitude of OAM. By exploring the strong Raman coupling between the pump and Stokes beams in higher-order Laguerre-Gauss modes, we demonstrate the discrimination of different optical vortex beams through nonlinear optical measurements.

4 天之前 · Orbital angular momentum (OAM) of light is an attractive degree of freedom for fundamental studies in quantum mechanics. In addition, the discrete unbounded state-space of OAM has been used to enhance classical and quantum communications. Unambiguous measurement of OAM is a key part of all such experiments. However, …

2023年3月1日 · Orbital angular momentum (OAM) of light is an important feature of structured electromagnetic fields exhibiting non-uniform spatial distribution. In contrast to a spin angular momentum (SAM) reflecting angular rotation of a polarization vector, OAM is the quantity that expresses the amount of dynamical rotation of a wavefront about an optical axis.

2022年9月30日 · Light beam carrying OAM, known as twisted light, propagates with a helical wave front and twists to the right or left determined by the sign of the topological charge m. Due to the helical phase structure, an OAM beam features a doughnut intensity profile with a phase singularity at the beam center.