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Center to explore new ways to manipulate light at the nanoscale

Mon, 09/12/2011 - 4:16am
Center for Photonic and Multiscale Nanomaterials 1

An illustration of the sub-wavelength focusing of light by a so-called "near-field plate," a device made of a metamaterial that was invented by physics professor Roberto Merlin and co-developed by electrical engineering associate professor Anthony Grbic. Image: Roberto Merlin

A new $13-million National Science Foundation center based at the University of Michigan will develop high-tech materials that manipulate light in new ways. The research could enable advances such as invisibility cloaks, nanoscale lasers, high-efficiency lighting, and quantum computers.

The Center for Photonic and Multiscale Nanomaterials, dubbed C-PHOM, involves engineering and physics researchers from the U-M College of Engineering and the College of Literature, Science, and the Arts, as well as close collaborators at Purdue University and several other institutions.

Photonics is the study and use of light to transmit and store information, as well as to image things humans can't see with unaided eyes. It's one of the key technologies underlying modern life, says Ted Norris, director of the new center and a U-M professor in the Department of Electrical Engineering and Computer Science.

Photonics provides the high-speed backbone of the Internet through fiber optics. It serves as a ubiquitous tool for medical imaging. And it enables the study of the most exotic ideas in quantum physics, such as entanglement and quantum computing.

"Advances in photonics depend critically on new materials, and this new center brings together top minds in electrical engineering, materials science, and physics to focus on two of the most exciting new directions in materials for nanophotonics," Norris says. "The cross-campus collaboration will enable fundamental advances."

Center for Photonic and Multiscale Nanomaterials 2

Metamaterials such as this one developed by associate professor Anthony Grbic (EECS) can focus light to specks smaller than their wavelength. Similar materials are being developed at the new Center for Photonic and Multiscale Nanomaterials. They have applications in wireless power transfer, high resolution microscopes, and even, potentially, invisibility cloaks. Image: Cyan James

The center has two thrusts. One group will focus on improving "wide bandgap semiconductors" such as gallium nitride, which could make possible quantum emitters that release one photon, or light particle, at a time and could advance quantum computing and quantum information processing.

Quantum computers could vastly improve computer security. Because they could theoretically factor numbers dramatically faster than conventional computers, they could allow for the creation of foolproof security codes. This research thrust also has applications in high-efficiency lighting and imaging. Leading this group is Pallab Bhattacharya, the Charles M. Vest Distinguished University Professor, and a professor in the U-M Department of Electrical Engineering and Computer Science.

A second group of researchers will develop better metamaterials, uniquely engineered mixtures of substances that enable scientists to make light act in ways it does not behave in nature. For example, metamaterials make it possible to focus light to a speck smaller than its wavelength, They could potentially be used to bend light around objects, making them invisible. They could also bring about "ultra subwavelength imaging" to see inside biological cells with unprecedented resolution. Leading this group is Roberto Merlin, the Peter A. Franken Collegiate Professor of Physics at U-M. His team will work in close collaboration with researchers at Purdue.

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