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Strong coupling is a phenomenon which occurs when the interaction between tworesonance systems is so strong that the oscillatory energy exchange betweenthem exceeds all dissipative loss channels. Each resonance can then no longerbe described individually but only as a part of the coupled, hybrid system.Here, we show that strong coupling can occur in a deep subwavelength nanofilmsupporting an epsilon near zero mode which is integrated into ametal-insulator-metal gap plasmon structure. To generate an epsilon near zeromode resonance in the short-wave infrared region, an indium tin oxide nanofilmof ~lambda/100 thickness is used. A polariton splitting value of 27%,corresponding to a normalized coupling rate of 0.135, is experimentallydemonstrated. Simulations indicate that much larger coupling rates, well withinthe ultra-strong regime where the energy exchange rate is comparable with thefrequency of light, are possible.

Experimental Observation of Strong Coupling Between an Epsilon-Near-Zero Mode in a Deep Subwavelength Nanofilm and a Gap Plasmon Mode