Related Experiment Video
Updated: Sep 22, 2025
12:14
The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
21.9K
Multichannel Superposition of Grafted Perfect Vortex Beams.
Hammad Ahmed1, Yuttana Intaravanne1, Yang Ming1,2
1Institute of Photonics and Quantum Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK.
Advanced Materials (Deerfield Beach, Fla.)
|May 24, 2022
Summary
Researchers developed a compact metasurface to generate and control grafted perfect vortex beams (GPVBs). This innovation simplifies complex optical setups, enabling new applications in singular optics and quantum science.
Area of Science:
- Optics and Photonics
- Metasurface Technology
- Quantum Science
Background:
- Grafted vortex beams, inspired by plant grafting, combine helical phase profiles of optical vortex beams.
- Grafted perfect vortex beams (GPVBs) possess unique optical properties and potential applications.
- Current methods for GPVB generation and manipulation involve complex and bulky optical systems, limiting practical use.
Purpose of the Study:
- To propose and demonstrate a compact metasurface approach for generating and manipulating GPVBs.
- To overcome the limitations of complex optical setups in current GPVB research.
- To enable new applications for GPVBs in singular optics and quantum science.
Main Methods:
- Utilizing a single metasurface to create superimposed GPVBs.
- Implementing multiple channels for GPVB superposition with varying topological charges.
- Introducing initial phase differences in metasurface design for singularity modulation.
Main Results:
- Demonstrated a compact metasurface capable of generating and manipulating GPVBs in four channels.
- Achieved asymmetric singularity distributions in superimposed GPVBs.
- Showcased the ability to modulate singularity positions via metasurface design.
Conclusions:
- A compact metasurface platform offers a simplified approach to generating and manipulating GPVBs.
- This technology facilitates sophisticated optical tasks previously challenging with conventional optics.
- The developed platform opens avenues for GPVB applications in singular optics, quantum science, and beyond.
Related Concept Videos
01:27Uniform Depth Channel Flow
179
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
179
01:07Interference and Superposition of Waves
5.5K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
5.5K
01:15Beams with Symmetric Loadings
250
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...
250
01:20Method of Superposition
1.2K
The method of superposition is a crucial technique in structural engineering, used to analyze the effect of multiple loads on beams. This approach involves calculating the deflection and slope for each load on a beam separately, and then summing these effects to determine the overall impact. It is applicable only when the beam material remains within its elastic limit, ensuring that deformations are linearly elastic.
When applying the method of superposition, each type of load—whether...
When applying the method of superposition, each type of load—whether...
1.2K
01:17Steady, Laminar Flow Between Parallel Plates
385
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
385
01:18Uniform Depth Channel Flow: Problem Solving
132
To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
132