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Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Simple terahertz vortex beam generator based on reflective metasurfaces.

Jiu-Sheng Li, Li-Na Zhang

|December 31, 2020

Summary

This summary is machine-generated.

This study introduces a novel reflective metasurface for generating orbital angular momentum (OAM) vortex beams in the terahertz (THz) range. The metasurface achieves high mode purity for OAM beams, enhancing wireless communication potential.

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Area of Science:

Physics
Electromagnetism
Metamaterials

Background:

Orbital angular momentum (OAM) offers a method to enhance wireless communication capacity.
Current OAM applications are primarily in optical and microwave frequencies.

Purpose of the Study:

To propose a reflective metasurface capable of generating OAM vortex beams in the terahertz (THz) region.
To demonstrate the generation of OAM vortex beams with varying topological charges (l=±1, l=±2).

Main Methods:

Design and simulation of a reflective metasurface structure.
Analysis of the metasurface's performance under circular polarized wave illumination.
Theoretical prediction and numerical simulations to validate OAM beam generation.

Main Results:

The metasurface successfully generates OAM vortex beams with topological charges l=±1 and l=±2.
A wide operational bandwidth from 0.3 THz to 0.45 THz was achieved.
High OAM beam mode purity exceeding 90% was observed at 0.4 THz.

Conclusions:

The designed reflective metasurface effectively generates THz vortex beams with tunable OAM topological charges.
The findings support the potential of metasurfaces for advanced THz wireless communication systems.