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Related Experiment Video

Updated: Sep 30, 2025

Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization

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Published on: July 12, 2016

Electrostatic tapering for efficient generation of radiation.

Miron Voin¹, Levi Schächter¹

¹Department of Electrical and Computer Engineering Technion-Israel Institute of Technology Haifa 32000, Israel.

Physical Review. E

|March 16, 2022

Summary

This summary is machine-generated.

Researchers show a new method for generating 1 THz terahertz radiation using electrostatic (dc) and electromagnetic (ac) fields. This technique achieves high efficiency, producing 1 Watt of power from a compact source.

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Area of Science:

Physics
Electromagnetism
Terahertz Technology

Background:

Generating high-frequency terahertz (THz) radiation efficiently remains a challenge.
Existing methods often require complex setups or lack scalability.
The interplay between direct current (dc) and alternating current (ac) electromagnetic fields is crucial for novel energy transfer mechanisms.

Purpose of the Study:

To demonstrate the feasibility of electrostatic (dc) tapering for THz generation.
To investigate the direct energy transfer from dc to ac fields at resonance.
To achieve high power output (1W) at 1 THz from a compact source (mm³).

Main Methods:

Utilized a combination of dc and ac electromagnetic fields for electron beam manipulation.
Employed an electron gun (e-gun), resonant zone, and collector with specific field configurations.
Incorporated dielectric Bragg-mirrors for radiation confinement and metallic hollow electrodes for wave synchronization.
Conducted numerical simulations to validate the proposed method.

Main Results:

Successfully demonstrated electrostatic (dc) tapering to compensate for the electromagnetic (ac) field's average force.
Achieved direct energy transfer from the dc to the ac field at resonance.
Simulations predicted the generation of approximately 1 Watt of power at 1 THz.
The proposed system operates with an efficiency of around 25% in a volume of a few cubic millimeters.

Conclusions:

The proposed method of dc tapering is feasible for efficient THz radiation generation.
The combined dc and ac field approach enables direct energy transfer and high power output.
This compact and efficient THz source has potential applications in various scientific and technological fields.