When someone opens a laptop, a router can quickly locate it and connect it to the local Wi-Fi network. That ability is a basic element of any wireless network known as link discovery, and now a team of researchers has developed a means of doing it with terahertz radiation, the high-frequency waves that could one day make for ultra-fast wireless data transmission.
Because of their high frequency, terahertz waves can carry hundreds of times more data than the microwaves used to carry our data today. But that high frequency also means that terahertz waves propagate differently than microwaves. Whereas microwaves emanate from a source in an omni-directional broadcast, terahertz waves propagate in narrow beams.
In a paper published in Nature Communications, researchers from Brown and Rice University showed that a device known as a leaky waveguide can be used for link discovery at terahertz frequencies. The approach enables link discovery to be done passively, and in one shot.
Finding a novel way to make link discovery work in the terahertz realm is important because existing protocols for link discovery in microwaves simply won’t work for terahertz signals. Even the protocols that have been developed for 5G networks, which are much more directional than standard microwaves, aren’t feasible for terahertz. That’s because as narrow as 5G beams are, they’re still around 10 times wider than the beams in a terahertz network.
News Source: Eurekalert
