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MIT metamaterial slows down light and collects energy

Using nanotechnology, it may be possible to slow down the speed of light and collect the energy lost, almost like a windmill or water mill for light. There’s always some sort of light around, so if you could steal some of its energy, you’d have a pretty damn good source of power.

The intriguingly named metamaterials are a new class of extremely thin artificial nanotech substances with properties unlike anything found in the natural world. Because they are created from the atom up, they can be perfectly engineered for any purpose by designing functional materials that interact with light in unconventional ways.

MIT Department of Mechanical Engineering lead author Nicholas X. Fang says that his international team was able to slow light to less than one-hundredth of its normal speed in a vacuum, making it much easier to trap inside the material. “When something is going very fast, it’s difficult to catch it,” he says, “so we slow it down so it’s easier to absorb.”

A lot of work has been done in engineering nanomaterials to more fully capture light to improve solar absorption. Some we’ve covered recently include Anorexic Silicon Wafer Could Slash Solar Cost, and Solar ‘Nanotrees’ Key To Clean Hydrogen Fuel? and Nanowire Mesh Could Be Solar Window Coating, but most have been limited to a very narrow range of wavelengths and angles of incidence, says MIT.

Fang’s design uses a pattern of wedge-shaped ridges whose widths are precisely tuned to slow and capture light of a wide range of wavelengths and angles of incidence.

Because their material would be both a very efficient absorber and emitter of photons, it could be used to either capture or emit electromagnetic radiation for very particular wavelengths, such as microwave and terahertz frequencies. It could be be made sensitive to just one specific range of wavelengths.

This means that, in addition to more efficient solar cells that so many are working on, it could also be used make devices for generating electricity from heat, and to make lightbulbs that use a fraction of the energy used today.

“We can selectively enhance the material’s interaction with infrared light at the wavelengths we want,” Fang says. The metamaterial wedges harvest photons at different depths, in rather the same way that our hearing works to sort sound frequencies.


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