Connect with us

Tech

New diode chain could be used to develop high-power terahertz technologies

Published

on

New diode chain could be used to develop high-power terahertz technologies


The team’s architecture and its functionality with metamaterial characteristics. Credit: Zhou et al.

Electromagnetic waves with frequencies between microwave and infrared light, also known as terahertz radiation, are leveraged by many existing technologies, including various imaging tools and wireless communication systems. Despite their widespread use, generating strong and continuous terahertz signals using existing electronics is known to be challenging.

To reliably generate terahertz signals, engineers often rely on frequency multipliers, that can distort an , to generate an with a desired frequency. Some of these circuits are based on Schottky barrier diodes, devices in which the junction between a metal and semiconductor form a one-way electrical contact.

While some frequency multipliers based on Schottky barrier diodes have achieved promising results, devices based on individual diodes can only handle a limited amount of energy. To increase the energy they can manage, engineers can use several diodes arranged in a chain. However, even this approach can have its limitations, as the distribution of the electromagnetic field between the diodes in a chain often becomes uneven.

Researchers at University of Electronic Science and Technology recently introduced a new chain design that could overcome this limitation, by reshaping local electromagnetic fields and distributing them more uniformly along the chain. The new asymmetric C-shaped diode chain, introduced in a paper published in Nature Electronics, was found to multiply frequencies more efficiently than most other diode-based frequency multipliers developed to date.

“Frequency multiplier devices based on Schottky barrier diodes can be used to generate , offering high power output and potential integration into all-solid-state systems,” wrote Honji Zhou, Tianchi Zhou and their colleagues in their paper.

“However, the scaling of the output power of such devices is often limited by the power handling capacity of a single diode. A connected chain of Schottky barrier diodes, together with a power combining approach, can be used to increase the terahertz output power. Yet the uneven field distribution among the diodes—which is related to the similarity between the terahertz wavelength and the physical dimensions of the diodes themselves—leads to lower efficiency and premature breakdown.”

To overcome the limitations of previously introduced single diode-based and diode chain-based frequency amplifiers, the researchers introduced a new design in which diodes are arranged in a double-layer chain shaped like the letter C. The shape of the chain is asymmetric, as this can improve the flow of electromagnetic fields between diodes.

The researchers assessed the performance of their newly designed diode chain in both simulations and laboratory tests. Remarkably, they found that it achieved one of the highest terahertz frequency-doubling efficiencies reported to date, highlighting its potential as a frequency multiplier.

“We report an asymmetric double-layer C-shaped diode chain structure that can adjust the local electromagnetic field distribution and enhance the conversion efficiency of the diode chain,” wrote the authors. “Our resulting device has a frequency doubling efficiency of 38%, with an output exceeding 300 mW at 170 GHz.”

The C-shaped diode chain could soon be improved and used to develop a wide range of electronic devices. In the future, it could enable the introduction of more compact wave transmitters and generators, which could be used to create more advanced imaging, sensing and communication systems.

Written for you by our author Ingrid Fadelli, edited by Gaby Clark, and fact-checked and reviewed by Robert Egan—this article is the result of careful human work. We rely on readers like you to keep independent science journalism alive.
If this reporting matters to you,
please consider a donation (especially monthly).
You’ll get an ad-free account as a thank-you.

More information:
Hongji Zhou et al, A terahertz nonlinear diode chain based on an asymmetric double-layer topology, Nature Electronics (2025). DOI: 10.1038/s41928-025-01460-9.

© 2025 Science X Network

Citation:
New diode chain could be used to develop high-power terahertz technologies (2025, October 31)
retrieved 31 October 2025
from https://techxplore.com/news/2025-10-diode-chain-high-power-terahertz.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.





Source link

Continue Reading
Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *

Tech

Meta Claims Downloaded Porn at Center of AI Lawsuit Was for ‘Personal Use’

Published

on

Meta Claims Downloaded Porn at Center of AI Lawsuit Was for ‘Personal Use’


Further, that alleged activity can’t even reliably be linked to any Meta employee, Meta claims.

Strike 3 “does not identify any of the individuals who supposedly used these Meta IP addresses, allege that any were employed by Meta or had any role in AI training at Meta, or specify whether (and which) content allegedly downloaded was used to train any particular Meta model,” Meta wrote.

Meanwhile, “tens of thousands of employees,” as well as “innumerable contractors, visitors, and third parties access the internet at Meta every day,” Meta argued. So while it’s “possible one or more Meta employees” downloaded Strike 3’s content over the past seven years, “it is just as possible” that a “guest, or freeloader,” or “contractor, or vendor, or repair person—or any combination of such persons—was responsible for that activity,” Meta claims.

Other alleged activity included a claim that a Meta contractor was directed to download adult content at his father’s house, but those downloads, too, “are plainly indicative of personal consumption,” Meta argued. That contractor worked as an “automation engineer,” Meta noted, with no apparent basis provided for why he would be expected to source AI training data in that role. “No facts plausibly” tie “Meta to those downloads,” Meta claims.

“The fact that the torrenting allegedly stopped when his contract with Meta ended says nothing about whether the alleged torrenting was performed with Meta’s knowledge or at its direction,” Meta wrote.

Meta Slams AI Training Theory as “Nonsensical”

Possibly most baffling to Meta in Strike 3’s complaint, however, is the claim about the “stealth network” of hidden IPs. This presents “yet another conundrum” that Strike 3 “fails to address,” Meta claims, writing, “why would Meta seek to ‘conceal’ certain alleged downloads of Plaintiffs’ and third-party content, but use easily traceable Meta corporate IP addresses for many hundreds of others?”

“The obvious answer is that it would not do so,” Meta claims, slamming Strike 3’s “entire AI training theory” as “nonsensical and unsupported.”



Source link

Continue Reading

Tech

Christian Influencers Are Throwing Their Hatch Clocks in the Trash

Published

on

Christian Influencers Are Throwing Their Hatch Clocks in the Trash


Treasure to Trash and Back Again

According to Erin Merani, Hatch’s vice president of marketing, this series of events was not, in fact, a planned marketing stunt, and Hatch is still figuring out the ramifications of the demon discourse. While Merani is glad the ads and programming “caught people’s attention,” she wants to clarify they were all meant for fun, and she’s heartened by how many users have rushed in to defend Hatch.

“We saw a lot of community jumping into the comments and saying, ‘Wait a minute, we missed the plot here!'” she says. “This is a Halloween-themed ad about their adult—not baby—product actually being the thing that will save you from the real evil: your phone. Your phone is actually keeping you up at night.’” To be clear, Hatch makes two devices, one specifically for kids and the other for adults. Any pop culture references, like Twilight, are exclusive to adults only via Hatch’s Restore 2 and 3 devices—they can’t be accessed on the Hatch Baby.

Then, a new trending topic arose about 48 hours later: “If you’re going to throw your Hatch device away, send it to me.”

Hatch took it and ran with it. “We used the cues of the community and sort of rode that wave with this idea of, ‘Hey, we know this is happening, and we wanted to address this while also pointing at having a little bit of fun with it,” Merani says.

Enter Hatch’s new “RePossession Program.” “We saw this overwhelming outreach of people who wanted to be ‘repossessed,'” Merani says, “so we were able to point people to our refurbishment program, to be able to keep those devices out of landfills and send ‘repossessed’ units out.”

So far, Hatch has had more than 10,000 related social media inquiries about receiving “repossessed Hatch devices,” and only 10 requests to send Hatch devices back to the company.

Ultimately, if you have a Hatch device and would like to send it back, you can contact customer service to arrange a return. On the other hand, you can now purchase refurbished machines (from the repossessed campaign and otherwise) here. No matter what side of the conversation you find yourself on, we can all agree on one thing: sleep is important, and you should definitely spend less time on your phone.





Source link

Continue Reading

Tech

Republicans Claimed Biden Censored YouTube. 20 Employees Seem to Say Otherwise

Published

on

Republicans Claimed Biden Censored YouTube. 20 Employees Seem to Say Otherwise


In a letter to a House committee last month, legal counsel for Alphabet, YouTube’s parent company, claimed that president Joe Biden’s administration sought to “influence” the company to crack down on Covid-19 misinformation. Republicans celebrated the letter as an apparent admission of Democratic censorship.

But Democrats seem to be throwing cold water on the allegations. In a new letter to YouTube CEO Neal Mohan first reported by WIRED, ranking member of the House Judiciary Committee Jamie Raskin shares half a dozen excerpts of transcripts with 20 Alphabet employees. According to the letter, none of them claim they were ever pressured to suppress or remove content at the behest of the Biden administration. The interviews come from several years of conversations with Youtube employees focused on policy and health, and in trust and safety roles; they appear to undercut years of GOP accusations of the Biden administration censoring social media platforms during the pandemic.

“As thousands of pages of transcripts of testimony make clear, not a single one of Alphabet’s employees testified about any coercion or undue pressure from the Biden administration,” Jamie Raskin, the committee’s top Democrat, says in the letter. “Are you now asserting that all of these witnesses lied to or misled the Committee? Is it more likely that all of these 20 witnesses got together to plan and provide false testimony or that you wrote an unsworn letter contradicting all of them to placate President Trump and his servants?”

The release of the full transcripts would need to be approved by Republicans on the committee, a spokesperson for the Democrats tells WIRED. (Congressman Jim Jordan’s office did not respond to a request for comment. He is the GOP leader of the committee.)

“Jim Jordan’s quest to find evidence of a censorship regime that never existed is well into its third year, and he continues to suppress the testimonies of the many, many witnesses who contradict his fantasy,” claims Renée DiResta, a disinformation expert and associate research professor at Georgetown University.

A week after counsel on behalf of Alphabet sent that letter to the committee in September claiming that they were pressed by the Biden administration, YouTube agreed to dismiss and settle a lawsuit involving the suspension of President Donald Trump’s account on the platform after the January 6 US Capitol riots (YouTube, which paid $24.5 million, admitted no fault in the settlement).



Source link

Continue Reading

Trending