Nanoparticles Enable New Levels of Holographic Optical Data Storage

Plasmonics makes holograms capable of storing twice as much information

2 min read
Nanoparticles Enable New Levels of Holographic Optical Data Storage
Illustration: Yunuen Montelongo

By exploiting the same properties of nanoparticles that made the Lycurgus Cup change colors depending on the light hitting it, researchers at the University of Cambridge have used nanoparticles to create holograms that could store twice as much information as today’s digital optical devices.

In research published in the journal Proceedings of the National Academy of Sciences,  the UK team used a thin film of silver nanoparticles to produce multicolor holograms.The nanoparticles create interference that allows the holograms to go beyond the normal limits of diffraction.

The nanoparticles are able to go beyond the normal diffraction limits by exploiting plasmonics, which takes advantage of oscillations in the density of electrons that are generated when photons hit a metal surface. Plasmonics has a number of potential applications, including transmitting data on computer chips and producing high-resolution lithography.

“This technology will lead to a new range of applications in the area of photonics, as conventional optical components simply cannot achieve this kind of functionality,” said Yunuen Montelongo, a PhD student from the Cambridge engineering department, who led the research, in a press release. “The potential of this technology will be realized when they are mass produced and integrated into the next generation of ultra-thin consumer electronics.”

In the device, each nanoparticle scatters light into varying colors depending on its size and shape. The scattered light from all the nanoparticles interacts and combines with each other to produce an image.

Among some of the unusual effects that can be produced by this device is its ability to display different images when illuminated with different color light and its ability to produce a multi-color image when multiple light sources are focused on it.

“This hologram may find a wide range of applications in the area of displays, optical data storage, and sensors,” said PhD student Calum Williams, a co-author of the paper. “However, scalable approaches are needed to fulfill the potential of this technology.”

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3 Ways 3D Chip Tech Is Upending Computing

AMD, Graphcore, and Intel show why the industry’s leading edge is going vertical

8 min read
Vertical
A stack of 3 images.  One of a chip, another is a group of chips and a single grey chip.
Intel; Graphcore; AMD
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A crop of high-performance processors is showing that the new direction for continuing Moore’s Law is all about up. Each generation of processor needs to perform better than the last, and, at its most basic, that means integrating more logic onto the silicon. But there are two problems: One is that our ability to shrink transistors and the logic and memory blocks they make up is slowing down. The other is that chips have reached their size limits. Photolithography tools can pattern only an area of about 850 square millimeters, which is about the size of a top-of-the-line Nvidia GPU.

For a few years now, developers of systems-on-chips have begun to break up their ever-larger designs into smaller chiplets and link them together inside the same package to effectively increase the silicon area, among other advantages. In CPUs, these links have mostly been so-called 2.5D, where the chiplets are set beside each other and connected using short, dense interconnects. Momentum for this type of integration will likely only grow now that most of the major manufacturers have agreed on a 2.5D chiplet-to-chiplet communications standard.

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