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

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Published on: April 25, 2019

Diffraction effects in highly defocused THz beams.

Felix Gorka, Enrique Castro-Camus, Daniel M Mittleman

|December 19, 2025

Summary

This summary is machine-generated.

Directional terahertz beams are crucial for communication due to higher losses and less diffraction. Measurements of beam transmission through blockages were compared with Fresnel diffraction theory to aid ultra-broadband technology development.

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Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Area of Science:

Physics
Electrical Engineering
Optical Engineering

Background:

Terahertz (THz) communication requires directional beams to overcome significant transmission losses.
Shorter THz wavelengths lead to less diffraction, impacting signal propagation through obstacles.

Purpose of the Study:

To measure frequency-dependent transmission losses of moderately divergent THz beams interacting with blockages.
To compare experimental data with quasi-optical models based on Fresnel diffraction theory.

Main Methods:

Measurements of transmission losses for beams with centimeter-scale waists.
Application of Fresnel diffraction theory for quasi-optical treatment of beam-blockage interactions.

Main Results:

Quantified frequency-dependent transmission losses for THz beams encountering various blockages.
Validated the quasi-optical model's accuracy in predicting beam interactions with obstacles.

Conclusions:

Experimental data aligns with Fresnel diffraction predictions for THz beam interactions.
Findings are essential for designing future ultra-broadband communication systems above 100 GHz.