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Thinner Than the Photon Itself – Scientists Invent Smallest Known Way To Guide Light

September 23, 2023
in Science
Thinner Than the Photon Itself – Scientists Invent Smallest Known Way To Guide Light
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Hanyu Hong Holding Material

Scientists at the University of Chicago found a glass crystal just a few atoms thick can trap and carry light—and could be used for applications. The material is visible as the thin line in the center of the plastic, held by study co-author Hanyu Hong. Credit: Jean Lachat

2D optical waveguides could pave the way for innovative technology.

Channeling light from one location to another is the backbone of our modern world. Across deep oceans and vast continents, fiber optic cables transport light containing data ranging from YouTube clips to banking transmissions—all within fibers as thin as a strand of hair.

University of Chicago Prof. Jiwoong Park, however, wondered what would happen if you made even thinner and flatter strands—in effect, so thin that they’re actually 2D instead of 3D. What would happen to the light?

Through a series of innovative experiments, he and his team found that a sheet of glass crystal just a few atoms thick could trap and carry light. Not only that, but it was surprisingly efficient and could travel relatively long distances—up to a centimeter, which is very far in the world of light-based computing.

Jiwoong Park and Scientist Hanyu Hong in the Laser Lab

Prof. Jiwoong Park (at left) and scientist Hanyu Hong (at right) in the laser lab, where they confirmed the material could carry light – even though it’s smaller than the light itself. Credit: Jean Lachat

The research, recently published in the journal Science, demonstrates what are essentially 2D photonic circuits, and could open paths to new technology.

“We were utterly surprised by how powerful this super-thin crystal is; not only can it hold energy, but deliver it a thousand times further than anyone has seen in similar systems,” said lead study author Jiwoong Park, a professor and chair of chemistry and faculty member of the James Franck Institute and Pritzker School of Molecular Engineering. “The trapped light also behaved like it is traveling in a 2D space.”

Guiding light

The newly invented system is a way to guide light—known as a waveguide—that is essentially two-dimensional. In tests, the researchers found they could use extremely tiny prisms, lenses, and switches to guide the path of the light along a chip—all the ingredients for circuits and computations.

Photonic circuits already exist, but they are much larger and three-dimensional. Crucially, in existing waveguides, the particles of light—called photons—always travel enclosed inside the waveguide.

With this system, the scientists explained, the glass crystal is actually thinner than the photon itself—so part of the photon actually sticks out of the crystal as it travels.

Jiwoong Park and Hanyu Hong

Prof. Jiwoong Park (at left) and scientist Hanyu Hong (at right) examine the material in Park’s lab at the University of Chicago. In tests, they could use tiny prisms, lenses, and switches to guide the path of the light along a chip—all the ingredients for circuits and computations. Credit: Jean Lachat

It’s a bit like the difference between building a tube to send suitcases around an airport, versus setting them on top of a conveyer belt. With a conveyor belt, the suitcases are open to the air and you can easily see and adjust them en route. This approach makes it much easier to build intricate devices with the glass crystals, as the light can be easily moved with lenses or prisms.

The photons can also experience information about the conditions along the way. Think of checking the suitcases coming in from outdoors to see if it’s snowing outside. Similarly, the scientists can imagine using these waveguides to make sensors at the microscopic level.

“For example, say you had a sample of liquid, and you wanted to sense whether a particular molecule was present,” explained Park. “You could design it so that this waveguide travels through the sample, and the presence of that molecule would change how the light behaves.”

The scientists are also interested in building very thin photonic circuits that could be stacked to integrate many more tiny devices into the same chip area. The glass crystal they used in these experiments was molybdenum disulfide, but the principles should work for other materials.

Though theoretical scientists had predicted that this behavior should exist, actually realizing it in the laboratory was a years-long journey, the scientists said.

“It was a really challenging but satisfying problem because we were walking into a completely new field. So everything we needed we had to devise ourselves—from growing the material to measuring how the light was moving,” said graduate student Hanyu Hong, the co-first author of the paper.

Reference: “Wafer-scale δ waveguides for integrated two-dimensional photonics” by Myungjae Lee, Hanyu Hong, Jaehyung Yu, Fauzia Mujid, Andrew Ye, Ce Liang and Jiwoong Park, 10 August 2023, Science.
DOI: 10.1126/science.adi2322

Myungjae Lee (formerly a postdoctoral researcher at UChicago, now faculty at Seoul National University) was the other first co-author of the paper. Postdoctoral researcher Jaehyung Yu, Fauzia Mujid (PhD’22, now at Ecolab), and graduate students Andrew Ye and Ce Liang were also authors on the paper.

The scientists used the University of Chicago Materials Research Science and Engineering Center, the fabrication facilities of the Pritzker Nanofabrication Facility, and the Cornell Center for Materials Research.

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/thinner-than-the-photon-itself-scientists-invent-smallest-known-way-to-guide-light/

Tags: PhotonscienceThinner
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