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Related Experiment Video

Updated: Jun 4, 2026

$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

Published on: April 25, 2019

Variable-focus terahertz lens.

Benedikt Scherger¹, Christian Jördens, Martin Koch

¹Institut for Hochfrequenztechnik, Technische Universität Braunschweig, Braunschweig, Germany. benedikt.scherger@physik.uni-marburg.de

|March 4, 2011

Summary

This summary is machine-generated.

We developed a new variable focus lens for terahertz (THz) applications. This lens uses medical white oil to adjust focal length, enabling easier alignment with visible light for THz systems.

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Area of Science:

Optics and Photonics
Terahertz (THz) Technology

Background:

Terahertz (THz) imaging and systems require specialized optical components.
Variable focus lenses are crucial for adapting THz systems to diverse applications.

Purpose of the Study:

To introduce a novel variable focus lens designed for the terahertz frequency range.
To demonstrate a method for dynamically adjusting the focal length of a THz lens.

Main Methods:

The lens design incorporates a mechanism to pump medical white oil into and out of the lens body.
The focal length is altered by changing the volume of the liquid within the lens.
Visible light alignment is facilitated by the liquid's optical transparency and refractive index matching in the visible spectrum.

Main Results:

Successfully demonstrated a variable focus lens operating in the THz range.
The focal length is controllable by adjusting the oil volume.
Enabled alignment using conventional optical light sources due to material properties.

Conclusions:

The developed variable focus lens offers a practical solution for THz optical systems.
Potential applications include quality control, stand-off detection, and wireless communication.
This technology enhances the versatility and usability of terahertz devices.