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Trapping Light in 3D: Physicists Unlock the Longstanding Mystery of Trapped Waves

June 18, 2023
in Science
Trapping Light in 3D: Physicists Unlock the Longstanding Mystery of Trapped Waves
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Trapping Optical Waves

Advanced computing has helped researchers solve a decades-old mystery about light localization in 3D structures. The study found that light can be trapped or “localized” in random packings of metallic spheres, paving the way for potential developments in lasers and photocatalysts. Credit: Yale University

A team of researchers has harnessed a remarkable increase in computing capability to solve a decades-long mystery regarding the potential for optical waves to be trapped in three-dimensional structures of randomly packed micro- or nanoparticles. This groundbreaking discovery could lead to advancements in lasers and photocatalysts, among other applications.

Electrons inside a material can either move freely to conduct current or get trapped and act as insulators. This depends on the amount of randomly distributed defects that the material has. When this concept, known as Anderson localization, was proposed in 1958 by Philip W. Anderson, it proved to be a game changer in contemporary condensed physics. The theory extended to both quantum and classical realms, including electrons, acoustic waves, water, and gravity. 

However, exactly how this principle plays out in the trapping, or localization, of electromagnetic waves in three dimensions has been unclear — despite 40 years of extensive studies. Led by Prof. Hui Cao, researchers have finally provided a definite answer as to whether light can be localized in three-dimensions. It’s a discovery that could open a wide range of avenues in both fundamental research and practical applications using 3D localized light. The results were published on June 15 in Flexcompute, a company that had a recent breakthrough in accelerating numerical solutions by orders of magnitude with their FDTD Software Tidy3D.

“It’s amazing how fast the Flexcompute numerical solver runs,” she said. “Some simulations that we expect would take days to do, it can do in just 30 minutes. This allows us to simulate many different random configurations, different system sizes, and different structural parameters to see whether we can get three-dimensional localization of light.” 

Cao assembled an international team that included her longtime collaborator Prof. Alexey Yamilov at Missouri University of Science and Technology and Dr. Sergey Skipetrov from University of Grenoble Alpes in France. They worked closely with Prof. Zongfu Yu at University of Wisconsin, Dr. Tyler Hughes, and Dr. Momchil Minkov at Flexcompute. 

Free of all artifacts that have previously marred experimental data, their study closes the long debate about the possibility of light localization in three dimensions with accurate numerical results. First, they showed that it is impossible to localize light in three-dimensional random aggregates of particles made of dielectric materials such as glass or silicon, which explained the failures of the intense experimental efforts in the past several decades. Secondly, they presented the unambiguous evidence of Anderson localization of electromagnetic waves in random packings of metallic spheres.  

“When we saw Anderson localization in the numerical simulation, we were thrilled,” Cao said. “It was incredible, considering that there has been such a long pursuit by the scientific community.”

Metallic systems have long been ignored due to their absorption of light. But even considering the loss of common metals such as aluminum, silver and copper, Anderson localization persists.  

“Surprisingly, even though the loss was not small, we can still see the evidence of Anderson localization. That means this is a very robust and strong effect.”

Besides resolving some long-standing questions, the research opens new possibilities for lasers and photocatalysts. 

“Three-dimensional confinement of light in porous metals can enhance optical nonlinearities, light-matter interactions, and control random lasing as well as targeted energy deposition.” Cao said. “So we expect there could be a lot of applications.”

Reference: “Anderson localization of electromagnetic waves in three dimensions” by Alexey Yamilov, Sergey E. Skipetrov, Tyler W. Hughes, Momchil Minkov, Zongfu Yu and Hui Cao, 15 June 2023, Nature Physics.

DOI: 10.1038/s41567-023-02091-7

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Tags: lightscienceTrapping
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