Controlling Ultrastrong Light-Matter Coupling at Room Temperature

The interaction between light and electrons in a system composed of two gold mirrors separated by a small distance and plasmonic gold nanorods produced ultrastrong coupling between light and matter at room temperature. The work stems from an international collaboration of researchers at Chalmers University and in Russia and Poland, as part of a study with broad implications in terms of both future research and potential applications, including light sources, nanomachinery, and quantum technology.