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Related Experiment Video

Updated: Mar 15, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Millimetre Wave with Rotational Orbital Angular Momentum.

Chao Zhang¹, Lu Ma¹

¹Labs of Avionics, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, P. R. China.

Scientific Reports

|September 7, 2016

Summary

Researchers demonstrate a novel method for receiving orbital angular momentum (OAM) signals in the time domain using a single antenna. This approach overcomes free-space reception challenges, paving the way for enhanced long-distance communication capacity.

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Area of Science:

Wireless communication
Electromagnetism
Signal processing

Background:

Orbital angular momentum (OAM) is studied for fibre and short-range communication capacity.
Millimetre wave (mmWave) OAM offers potential for increased communication capacity.
Current OAM reception methods in free space are impractical for long-distance transmission due to energy divergence.

Purpose of the Study:

To demonstrate a practical method for receiving OAM signals in free space.
To enable long-distance transmission of millimetre wave OAM signals.
To overcome the limitations of spatial domain OAM reception.

Main Methods:

Fabrication of a prototype antenna.
Demonstration of time-domain OAM reception via a single antenna.
Analysis of phase and frequency of received signals.

Main Results:

OAM signals are successfully received in the time domain, not the spatial domain.
Received signals exhibit characteristics similar to orthogonal frequency division multiplexing (OFDM) signals.
Phase rotation is observed for different OAM modes.

Conclusions:

Time-domain OAM reception via a single antenna is feasible.
This method offers a practical solution for long-distance mmWave communication.
The technique shows promise for practical reception of diverse OAM modes.