Russian scientists forced graphene to absorb light energy

The global goal of our research is to create ultra-compact devices that could with a high

efficiently convert the energy of light intocalled surface plasmon polaritons. On their basis, it is possible to create light energy converters like solar batteries, only with an efficiency many times higher.

Valentin Volkov, one of the authors of the work, director of the Center for Photonics and 2D Materials, MIPT

Recall that graphene is a single layer of carbon atoms: they are bonded to each other by chemical bonds. From the outside, it looks like a honeycomb.

In order to improve the transmission efficiencyenergy of light into vibrations on the graphene surface up to 90%, the group of researchers used an energy conversion scheme, like a laser, as well as collective resonance effects.

It turns out that the strongest effect can beachieve when light is focused on a two-dimensional material that is only one atomic layer thick. Since such two-dimensional materials have a sufficiently high refractive index.

A group of scientists determined that if, in addition to makingdefects in the structure of the graphene sheet itself and also cover it with quantum dots, placing them at a precisely verified distance above the graphene surface, then the force of interaction between graphene and light particles can be increased several times.

As a result, the efficiency of energy flow into plasmon-polaritons was found to be no higher than 10%.

Scientists hope that further experiments will confirm the results of their calculations, and will also show that graphene can be used to concentrate light energy and mass for other purposes.

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