Ultrastrong light-matter-coupling at 250 GHz

Curdin Maissen; Giacomo Scalari; Mattias Beck; Jérôme Faist; Christian Reichl; Werner Wegscheider

doi:10.1117/12.2211129

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14 March 2016 Ultrastrong light-matter-coupling at 250 GHz

Curdin Maissen, Giacomo Scalari, Mattias Beck, Jérôme Faist, Christian Reichl, Werner Wegscheider

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Proceedings Volume 9746, Ultrafast Phenomena and Nanophotonics XX; 974617 (2016) https://doi.org/10.1117/12.2211129
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

The Ultrastrong light-matter coupling regime is attained when the coupling rate Ω is comparable or larger than the resonance frequency of the light ω_LC and electronic transition frequency of the matter part ω_c. 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 ω_LC = 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/ω_c = 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); https://doi.org/10.1117/12.2211129

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