全在芯片上可重新配置的标量和矢量轨道角动量束的生成
Weike Zhao1, Xiaolin Yi1, Jieshan Huang2
1State Key Laboratory for Extreme Photonics and Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310058, China.
Light, science & applications
|June 30, 2025
概括
研究人员开发了一种新型的芯片结构光发电机. 该设备在单个芯片上创建具有控制自旋角动量 (SAM) 和轨道角动量 (OAM) 的束,从而实现新的应用.
科学领域:
- 光子学和光学工程的工程.
- 集成光学 集成光学 集成光学
- 量子技术 量子技术 量子技术
背景情况:
- 具有旋转角动量 (SAM) 和轨道角动量 (OAM) 的结构光对于先进的科学研究和应用至关重要.
- 现有的结构光芯片解决方案往往是静态的,或者它们的重新配置性有限.
- 对于所有角动量状态来说,完全可重新配置的芯片内源仍然是一个重大挑战.
研究的目的:
- 报告第一个完全可重新配置的全在芯片结构光源.
- 为了证明在芯片上创建标量和矢量角运动量束.
- 为了允许任意叠加的光模式,以量身定制的光束生成.
主要方法:
- 使用一个在绝缘体 (SOI) 芯片与模式复合器集成.
- 在多模式总线波导中选择性刺激了六种线性偏振 (LP) 模式.
- 使用SOI芯片精确控制模态功率和相位,以合成所需的光结构.
主要成果:
- 通过可控制的SAM和OAM成功生成了芯片上的结构光.
- 合成了常见的圆柱形向量旋转束和OAM束,具有控制的旋转和拓电荷.
- 在电信频段中展示了高切换速度和运行.
结论:
- 开发的紧结构光发生器是第一个完全可重新配置的芯片上解决方案,用于角动量束.
- 这项技术为光通信和集成量子技术的进步铺平了道路.
- 对模态功率和相位的精确控制允许灵活生成复杂的光结构.
相关概念视频
Beams with Symmetric Loadings
246
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
The M/EI...
246
Conservation of Angular Momentum
10.8K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce...
10.8K
Angular Momentum about an Arbitrary Axis
258
Imagine a rigid body with a mass denoted as 'm', which has its center of mass at point G and is rotating around an inertial reference frame. The angular momentum at an arbitrary point P can be calculated by taking the cross product of the position vector and linear momentum vector for each individual mass element.
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
The velocity of a mass element comprises its translational velocity and the relative velocity instigated by the body's rotation. Substituting the velocity equation into...
258
Angular Momentum: Single Particle
6.6K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
6.6K
Beams with Unsymmetric Loadings
168
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
168
Conservation of Angular Momentum: Application
11.4K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
11.4K


