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Generating Electromagnetic Radiations

Generating Electromagnetic Radiations

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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Updated: Oct 17, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Published on: August 12, 2013

Sub-terahertz vortex beam generation using a spiral metal reflector.

Yumina Hira, Yasuaki Monnai

|October 7, 2021

Summary

Researchers developed a novel spiral metal reflector for generating sub-terahertz vortex beams. This inexpensive and versatile method works for both polarizations, overcoming limitations of existing techniques.

Area of Science:

Electromagnetics and Optics
Terahertz Technology

Background:

Vortex beams, characterized by a central null and ring-shaped intensity profile, are crucial for advanced sensing and communication applications.
Generating sub-terahertz vortex beams faces challenges, including dielectric losses with phase plates and inefficiency/polarization sensitivity of holographic gratings.

Purpose of the Study:

To develop a novel, efficient, and polarization-versatile method for generating sub-terahertz vortex beams.
To address the limitations of existing sub-terahertz vortex beam generation techniques.

Main Methods:

Design of a spiral metal reflector component based on a derived direct equation for its surface shape.
Experimental validation of the designed reflector by mapping the radiation pattern of generated vortex beams.

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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

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Published on: March 23, 2017

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Last Updated: Oct 17, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

Published on: March 23, 2017

Main Results:

Successful generation of sub-terahertz vortex beams using the spiral metal reflector.
Demonstration of the reflector's capability to generate vortex beams for both orthogonal polarizations.
Validation of the WR10 frequency band (75-110 GHz) operation.

Conclusions:

The spiral metal reflector offers an inexpensive and versatile approach for sub-terahertz vortex beam generation.
This method overcomes the drawbacks of dielectric phase plates and holographic diffraction gratings.
The developed technique holds promise for practical applications in sensing and communications.