Researchers design nanoscale light-based feedback loop: Page 2 of 2

June 11, 2019 //By Julien Happich
feedback loop
Researchers at Chalmers University of Technology, Sweden, have discovered a completely new way of capturing, amplifying and linking light to matter at the nanolevel. Using a tiny box, built from stacked atomically thin material, they have designed a novel type of feedback loop in which light and matter become one.

The discovery came about when Verre and his departmental colleagues Timur Shegai, Denis Baranov, Battulga Munkhbat and Mikael Käll combined two different concepts in an innovative way. Mikael Käll’s research team is working on what are known as nanoantennas, which can capture and amplify light in the most efficient way. Timur Shegai’s team is conducting research into a certain type of atomically thin two-dimensional materials known as transition metal dichalcogenides (TMDCs), which resembles graphene. It was by combining the antenna concept with stacked two-dimensional material that the new possibilities were created.

By creating a tiny resonance box with WS2, they were able to make the light and matter interact inside it, ensuring that the light is captured and bounces round in a certain ‘tone’ inside the material, efficiently transferring the light energy to the electrons of the TMDC material and back again.

The anapole-exciton polaritons light-matter interaction is akin to having the light energy oscillates between two states – light waves and matter – while it is captured and amplified inside the box. The researchers have succeeded in combining light and matter extremely efficiently in a single particle with a diameter of only 100 nanometres.

“We have succeeded in demonstrating that stacked atomically thin materials can be nanostructured into tiny optical resonators, which is of great interest for photonics applications. Since this is a new way of using the material, we are calling this ‘TMDC nanophotonics’. I am certain that this research field has a bright future,” says Timur Shegai, Associate Professor in the Department of Physics at Chalmers and one of the authors of the article.

Chalmers University of Technology – www.chalmers.se


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