Tech
Compact phononic circuits guide sound at gigahertz frequencies for chip-scale devices
Phononic circuits are emerging devices that can manipulate sound waves (i.e., phonons) in ways that resemble how electronic circuits control the flow of electrons. Instead of relying on wires, transistors and other common electronic components, these circuits are based on waveguides, topological edge structures and other components that can guide phonons.
Phononic circuits are opening new possibilities for the development of high-speed communication systems, quantum information systems and various other technologies.
To be compatible with existing infrastructure, including current microwave communication systems, and to be used to develop highly performing quantum technologies, these circuits should ideally operate at gigahertz (GHz) frequencies. This essentially means that the sound waves they generate and manipulate oscillate billions of times per second.
Researchers at University of Science and Technology of China, Penn State University and other institutes recently developed new compact phononic circuits that can reliably guide sound waves at 1.5 GHz.
These new circuits, introduced in a paper published in Nature Electronics, could be used to create both quantum and classical devices that could advance communications, sensing and information processing.
“We were inspired by the success of integrated photonics and wanted to show that similar concepts could be applied to sound waves,” Mourad Oudich, co-first author of the paper, told Tech Xplore.
“Our goal was to build tiny, chip-scale phononic circuits operating at GHz frequencies that are compact, reconfigurable, and robust enough for real-world applications.”
The circuits introduced by these researchers are designed to confine acoustic waves at GHz frequencies, guiding them through tiny waveguides on a chip. Notably, these wavelengths sit directly on a substrate, which could facilitate the circuits’ large-scale fabrication.

“Our phononic circuits are made of microscopic ‘highways’ that guide sound instead of light,” explained Oudich.
“By arranging these waveguides in special patterns, we create topological pathways where sound travels smoothly even around corners or defects. This makes the circuits more reliable and much smaller than traditional acoustic devices.”
To evaluate their phononic circuits, the researchers monitored the propagation of phonons inside them using a high-resolution scanning optical vibrometer. This is a device that can measure subtle vibrations on a surface, such as those produced by the movement of phonons through the waveguides.
Oudich and his colleagues injected phonons into their circuits’ edge channels and showed that they successfully traveled through the system without scattering. They also performed a so-called Mach-Zehnder Interferometer test, which confirmed the reconfigurability of their phononic devices (i.e., their ability to rapidly alter the paths of phonons).
“We demonstrated, for the first time, topological sound transport and a phononic Mach–Zehnder interferometer directly on a chip at gigahertz frequencies,” said Oudich.
“These advances could lead to new acoustic filters for communications and even help in developing phonon-based components for future quantum technologies.”
The reconfigurable devices developed by this team of researchers could soon be used to fabricate a wide range of technologies, including quantum processors, high-precision sensors and new hybrid communication systems. Oudich and his colleagues are currently planning further research aimed at combining their circuits with existing electronics and components.
“We now aim to integrate the phononic circuits with electronic and photonic systems, making them useful for hybrid technologies,” added Oudich.
“In the long run, we want to build a full ‘phononic toolbox’ for advanced information processing and sensing.”
Written for you by our author Ingrid Fadelli, edited by Sadie Harley, 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.
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More information:
Xin-Biao Xu et al, Gigahertz topological phononic circuits based on micrometre-scale unsuspended waveguide arrays, Nature Electronics (2025). DOI: 10.1038/s41928-025-01437-8.
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Tech
This Jammer Wants to Block Always-Listening AI Wearables. It Probably Won’t Work
Deveillance also claims the Spectre can find nearby microphones by detecting radio frequencies (RF), but critics say finding a microphone via RF emissions is not effective unless the sensor is immediately beside it.
“If you could detect and recognize components via RF the way Spectre claims to, it would literally be transformative to technology,” Jordan wrote in a text to WIRED after he built a device to test detecting RF signatures in microphones. “You’d be able to do radio astronomy in Manhattan.”
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Even if a device could detect a microphone’s exact location, objects around a room can change how the frequencies spread and interact. The emitted frequencies could also be a problem. There haven’t been adequate studies to show what effects ultrasonic frequencies have on the human ear, but some people and many pets can hear them and find them obnoxious or even painful. Baradari acknowledges that her team needs to do more testing to see how pets are affected.
“They simply cannot do this,” engineer and YouTuber Dave Jones (who runs the channel EEVblog) wrote in an email to WIRED. “They are using the classic trick of using wording to imply that it will detect every type of microphone, when all they are probably doing is scanning for Bluetooth audio devices. It’s totally lame.” Baradari reiterates that the Spectre uses a combination of RF and Bluetooth low energy to detect microphones.
WIRED asked Baradari to share any evidence of the Spectre’s effectiveness at identifying and blocking microphones in a person’s vicinity. Baradari shared a few short videoclips of people putting their phones to their ears listening to audioclips—which were presumably jammed by the Spectre—but these videos do little to prove that the device works.
Future Imperfect
Baradari has taken the critiques in stride, acknowledging that the tech is still in development. “I actually appreciate those comments, because they’re making me think and see more things as well,” Baradari says. “I do believe that with the ideas that we’re having and integrating into one device, these concerns can be addressed.”
People were quick to poke fun at the Spectre I online, calling the technology the cone of silence from Dune. Now, the Deveillance website reads, “Our goal is to make the cone of silence become reality.”
John Scott-Railton, a cybersecurity researcher at Citizen Lab, who is critical of the Spectre I, lauded the device’s virality as an indication of the real hunger for these kinds of gadgets to win back our privacy.
“The silver lining of this blowing up is that it is a Ring-like moment that highlights how quickly and intensely consumer attitudes have shifted around pervasive recording devices,” says Scott-Railton. “We need to be building products that do all the cool things that people want but that don’t have the massive privacy- and consent-violation undertow. You need device-level controls, and you need regulations of the companies that are doing this.”
Cooper Quintin, a senior staff technologist at the Electronic Frontier Foundation, echoed those sentiments, even if critics believe Deveillance’s efforts to be flawed.
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Courtesy of Google
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Tech
I’ve Tried Every Pixel Phone Ever Made—Here Are the Best to Buy Right Now
Portrait Light: You can change up the lighting in your portrait selfies after you take them by opening them up in Google Photos, tapping the Edit button, and heading to Actions > Portrait Light. This adds an artificial light you can place anywhere in the photo to brighten up your face and erase that 5 o’clock shadow. Use the slider at the bottom to tweak the strength of the light. It also works on older Portrait mode photos you may have captured. It works only on faces.
Health and Accessibility Features
Cough & Snore Detection (Tensor G2 and newer): On the Pixel 7 and newer, you can have your Pixel detect if you cough and snore when sleeping, provided you place your Pixel near your bed before you nod off. This will work only if you use Google’s Bedtime mode function, which you can turn on by heading to Settings > Digital Wellbeing & Parental Controls > Bedtime Mode.
Guided Frame (Tensor G2 and newer): For blind or low-vision people, the camera app can now help take a selfie with audio cues (it works with the front and rear cameras). You’ll need to enable TalkBack for this to work (Settings > Accessibility > TalkBack). Then open the camera app. It will automatically help you frame the shot.
Simple View: This mode makes the font size bigger, along with other elements on the screen, like widgets and quick-settings tiles. It also increases touch sensitivity, all of which hopefully makes it easier to see and use the screen. You can enable it by heading to Settings > Accessibility > Simple View.
Safety and Security Features
Theft Protection: This is a broader Android 15 feature, but essentially, Google’s algorithms can figure out if someone snatches your Pixel out of your hands. If they’re trying to get away, the device automatically locks. Additionally, with another device, you can use Remote Lock to lock your stolen Pixel with your phone number and a security answer. To toggle these features on, go to Settings > Security & privacy > Device unlock > Theft protection.
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Courtesy of Google
Private Space: Another Android 15 addition, Pixel phones finally have a feature that lets you hide and lock select apps. You can use a separate Google account, set a lock, and install any app to hide away. To set it all up, head to Settings > Security & privacy > Private space.
Satellite eSOS (Pixel 9 and Pixel 10 series, excluding Pixel 9a): Like Apple’s SOS feature on iPhones, you can now reach emergency contacts or emergency services even when you don’t have cell service or Wi-Fi connectivity. It’s not just available in the continental US, but also in Hawaii, Alaska, Canada, and even Europe.
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