(a) Light-current-voltage (L-I-V) characteristics of a typical periodicity-graded GPH surface-emitting THz laser measured at different heat-sink temperatures. The device was operated with 25 ms-long pulses, at a frequency of 20 Hz.
Optimal intersubband polariton-dispersion diagram for an optical pumping experiment. The minimum Rabi splitting occurs at k=0, and light is resonantly injected at an angle of 20°, one LO-phonon away from the lower state minimum energy.
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Typical dispersion diagram of intersubband polaritons in a metal-dielectric-metal cavity. The various loss channels are represented as well as the scattering mechanism based on the longitudinal optical phonon, which is relevant for the operation of a bosonic laser.
(a) Schematic diagram of a lithographically tunable LC resonator with an embedded parabolic quantum well. The electric and magnetic dipoles excited by the incoming radiation are shown.
(b) The real devices: scanning electron microscope pictures of three LC resonators with different antenna lengths.
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Reflectivity spectra of a sample where an intersubband excitation in a doped quantum well couples with the fundamental mode of a metallic nano-antenna. The emergence of upper and lower polariton states is evidence of the strong coupling regime.