Thin layers of semiconductors where the permittivity crosses zero, support a particular polariton mode called epsilon-near-zero (ENZ) mode. This zero crossing can be obtained near optical phonon resonances in dielectrics or the plasma frequency in doped semiconductors. The coupling of metamaterial resonators to these ENZ modes leads to particularly large Rabi splittings. ENZ layers can be added to metamaterial-based strongly coupled systems to increase this coupling even further. I will discuss several examples of these coupled systems that include metasurfaces, phonons, intersubband transitions and ENZ modes.
Igal Brener, Salvatore Campione, and Francois Marquier, "Metasurfaces and epsilon-near-zero modes in semiconductors (Presentation Recording)," Proc. SPIE 9544, Metamaterials, Metadevices, and Metasystems 2015, 95442F (Presented at SPIE Nanoscience + Engineering: August 13, 2015; Published: 5 October 2015); https://doi.org/10.1117/12.2190299.4519316184001.
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