EurekAlert  March 2, 2021 An international team of researchers (UK, Russia) has reported a way to create quasiparticles that bind together two differently coloured particles of light. They have named these formations photon-photon polaritons. They tuned a laser to the specific resonance frequency where a photon is expected to be absorbed, yet no resonance absorption happened. Instead, the photon-photon interaction made up two new resonance frequencies away from the old one. The microresonator provided a whole set of split resonances, where each photon-photon pair displayed its own momentum and energy, allowing the researchers to apply the quasiparticle concept and calculate […]