Strong light-matter coupling at terahertz frequencies at room temperature in electronic LC resonators

Abstract

Strong light-matter coupling at room temperature in the terahertz (THz) range is demonstrated. The studied system consists of electronic intersubband transitions in AlxGa1−xAs parabolic quantum wells coupled to an electronic LC microcavity resonator allowing strong subwavelength confinement of the cavity mode. The measured Rabi frequency is 0.48 THz, corresponding to 14% of the center frequency, independent of the temperature of the system in the range 10–300 K.