THz Ultrastrong Coupling in an Engineered Fabry-Perot Cavity
Elena Mavrona (ETH Zürich, Swiss Federal Laboratories for Materials Science and Technology (Empa))
S. Rajabali (ETH Zürich)
Felice Appugliese (ETH Zürich)
Johan Andberger (ETH Zürich)
Mattias Beck (ETH Zürich)
Giacomo Scalari (ETH Zürich)
J. Faist (ETH Zürich)
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Abstract
We report a monolithic THz planar Fabry-Perot cavity fabricated with wafer bonding and provided with metallic mirrors with subwavelength apertures. We demonstrate its coupling to the cyclotron resonance of a high-mobility, two-dimensional electron gas.Qfactors up to 89 are observed for the first mode at ≃300 GHz, with cooperativity C= 56.4 and a normalized coupling ratio Ωωin the first mode of up to 17.5% and the third mode of up to 6.4%.
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