Multimode ultrastrong coupling in three-dimensional photonic-crystal cavities

Multimode ultrastrong coupling in three-dimensional photonic-crystal cavities
Fuyang Tay, Ali Mojibpour, Stephen Sanders, Shuang Liang, Hongjing Xu, Geoff C Gardner, Andrey Baydin, Michael J Manfra, Alessandro Alabastri, David Hagenmüller, Junichiro Kono. Nature Communications [PDF] [Article]