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14 March 2016 Ultrastrong light-matter-coupling at 250 GHz
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The Ultrastrong light-matter coupling regime is attained when the coupling rate Ω is comparable or larger than the resonance frequency of the light ωLC and electronic transition frequency of the matter part ωc. This regime has attained much attention due to the peculiar properties of the coupled state. Here, we present a physical system showing a high normalized coupling rate not far from unity. The LC-mode of a THz-metasurface unitcell at ωLC = 2π x 0:25 THz is coupled to the collective cyclotron transition of 4 two dimensional electron gases (2DEGs) resulting in a normalized coupling rate of Ω/ωc = 0:9, Ω being the vacuum Rabi frequency. The high coupling rate is enabled by the small mode volume provided by the LC-mode of the split ring resonator geometry which was employed. Equally important is the large collective transition dipole element of the cyclotron transition.
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Curdin Maissen, Giacomo Scalari, Mattias Beck, Jérôme Faist, Christian Reichl, and Werner Wegscheider "Ultrastrong light-matter-coupling at 250 GHz", Proc. SPIE 9746, Ultrafast Phenomena and Nanophotonics XX, 974617 (14 March 2016);

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