Russian scientists from Skoltech and ITMO have achieved the controlled radiation of polaritons at room temperature using CSPBBBR3 perovskite crystals. This discovery can be an important step towards the creation of completely optical logical devices that will find use in the new generation of microchips.
Polaritons are hybrid particles of light and substances that occur with strong interaction between photons with excitons (excited states of atoms in the crystal). Previously, obtaining polaritons in traditional semiconductors required very low, cryogenic temperatures. Studies at room temperature were mainly conducted on organic polymers with limited possibilities.
In a new study, scientists used the inorganic perovskite CSPBBR3, known for its high energy of exciton bonds, optical stability, and uniform crystal lattices. They successfully achieved controlled radiation of polaritons in the green spectrum at room temperature. The wavelength of the radiation could be changed by over 23 nm using a specialized device that adjusted the length of the micro-resonator without moving the crystal.
This breakthrough paves the way for the development of high-speed completely optical logical devices based on polaritons. CSPBBR3 is seen as a promising platform for such advancements. The research was led by Professor Pavlos Lagudakis, Director of the Center for Photon Sciences and Engineering at Skoltech.