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Archive for the ‘holograms’ category

Dec 5, 2024

Scientists exploit photo-induced chirality in thin films to improve authentication tech

Posted by in categories: economics, holograms, security

In today’s world, the fight against counterfeiting is more critical than ever. Counterfeiting affects about 3% of global trade, posing significant risks to the economy and public safety. From fake pharmaceuticals to counterfeit currency, the need for secure and reliable authentication methods is paramount. Authentication labels are commonly used—such as holograms on bank notes and passports—but there is always a need for new unfalsifiable technologies.

This is where research recently published in Applied Sciences comes into play. Led by a team of scientists from Oxford University, the University of Southampton, and Diamond Light Source, the UK’s national synchrotron, the work focuses on developing a new technology for writing and reading covert information on labels.

This technology leverages the unique properties of Ge2Sb2Te5 thin films, which can change their structure when exposed to specific types of laser light. By using circularly or linearly polarized laser light, the researchers can encode hidden information in these thin films. This information can then be revealed using a simple reading device, making the technology both advanced and accessible.

Dec 1, 2024

In His Final Years, Stephen Hawking Thought the Universe Could Be a Hologram

Posted by in categories: cosmology, evolution, holograms, physics

Thus, when one looks back in time, say by looking at light from a distant galaxy that has traveled billions of years to reach us, this is akin to “zooming out” on the hologram and making its details fuzzier in the process. This zooming out can continue until all the details of the hologram disappear altogether, which in the model of the universe suggested by Hawking and Hertog, would be the origin of time at the Big Bang.

“The crux of our hypothesis is that when you go back in time, to this earliest, violent, unimaginably complicated phase of the universe, in that phase you find a deeper level of evolution, a level in which even the laws of physics co-evolve with the universe that is taking shape,” Hertog said. “And the consequence is that if you push everything even further backward, into the Big Bang, so to speak, even the laws of physics disappear.”

Nov 1, 2024

Holographic 3D Printing has the potential to Revolutionize Multiple Industries

Posted by in categories: 3D printing, chemistry, holograms

A pioneering technique shows how sound can be used to create entire objects quickly and at once. Researchers at Concordia have developed a novel method of 3D printing that uses acoustic holograms. And they say it’s quicker than existing methods and capable of making more complex objects.

The process, called holographic direct sound printing (HDSP), is described in a recent article in the journal Nature Communications. It builds on a method introduced in 2022 that described how sonochemical reactions in microscopic cavitations regions — tiny bubbles — create extremely high temperatures and pressure for trillionths of a second to harden resin into complex patterns.

Now, by embedding the technique in acoustic holograms that contain cross-sectional images of a particular design, polymerization occurs much more quickly. It can create objects simultaneously rather than voxel-by-voxel.

Oct 25, 2024

If the Universe Is a Hologram, This Long-Forgotten Math Could Decode It

Posted by in categories: holograms, mathematics, quantum physics, space

A 1930s-era breakthrough is helping physicists understand how quantum threads could weave together into a holographic space-time fabric.

Oct 9, 2024

Holographic 3D printing has the potential to revolutionize multiple industries, say researchers

Posted by in categories: 3D printing, holograms

Researchers at Concordia have developed a novel method of 3D printing that uses acoustic holograms. And they say it’s quicker than existing methods and capable of making more complex objects.

Oct 2, 2024

Holographic Dark Energy: A New Model for Understanding the Universe’s Expansion

Posted by in categories: cosmology, holograms, quantum physics

Following the accelerated expansion discovery of the Universe, scientists introduced dark energy concepts, which faced issues like the cosmological constant problem.

Researchers at IKBFU developed a holographic dark energy model based on quantum gravity, which views the Universe as a hologram. This model, initially unstable, was refined to treat dark energy as perturbations, stabilizing it. It is now being tested against observational data for accuracy.

Discovery of Accelerated Universe Expansion.

Sep 17, 2024

Dr. Hologram will see you now: Virtual specialists visit cancer patients

Posted by in categories: biotech/medical, holograms, mobile phones

Back in August 2021, LA-based Portl launched a 7-ft-tall hologram projection box for life-like remote communications. Now renamed Proto, the company has revealed that its Epic technology is allowing cancer patients to consult life-size virtual specialists.

Proto was founded in 2018 by David Nussbaum, who took his experience working on huge holograms for arena gigs, movie premieres and fashion shows to produce a hologram in a box called the Epic. The idea is to plonk the machine in a venue, university, boardroom, medical facility and so on, and allow folks to chat with a life-like 3D hologram of a person who might be thousands of miles away.

Continue reading “Dr. Hologram will see you now: Virtual specialists visit cancer patients” »

Sep 11, 2024

Smartphone-based microscope rapidly reconstructs 3D holograms

Posted by in categories: education, holograms, mobile phones

Researchers have developed a new smartphone-based digital holographic microscope that enables precision 3D measurements. The highly portable and inexpensive microscope could help bring 3D measurement capabilities to a broader range of applications, including educational uses and point-of-care diagnostics in resource-limited settings.

Aug 31, 2024

Quantum holograms can send messages that disappear

Posted by in categories: holograms, particle physics, quantum physics

Entangled particles of light can transmit holographic images that can be selectively erased, allowing for secure communications that can also be deleted.

By Karmela Padavic-Callaghan

Aug 30, 2024

Complete-basis-reprogrammable coding metasurface for generating dynamically-controlled holograms

Posted by in category: holograms

An article in Opto-Electronic Advances, discusses complete-basis-reprogrammable coding metasurface for generating dynamically-controlled holograms under arbitrary polarization states.

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