Université Paris-Sud – Centre for Nanoscience and Nanotechnology (C2N)

Typical periodicity-graded GPH surface-emitting THz laser
(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.
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Optimal intersubband polariton-dispersion diagram
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
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.
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Diagram of a lithographically tunable LC resonator
(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
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.
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The Centre for Nanoscience and Nanotechnology (C2N) is one of the largest laboratories of University Paris- Sud with 283 members including 83 permanent researchers, 160 PhD students and post-doctoral researchers and 40 technical and administrative staff members. It is a joint unit between University Paris-Sud and the French national research council (CNRS). Its activities focus on nanoscience: nanophotonics, nanoelectronics and micro-nano systems. IEF at UPS hosts one major nanotechnology clean-room facilities in France, the CTU IEF-Minerve, which will be crucial for the success of the project. Within the Photonics Department, the QCL team has a long track record on intersubband devices science and technology in various material systems.

Main contact: Dr. Raffaele COLOMBELLI – Email: raffaele.colombelli@u-psud.fr

Centre for Nanoscience and Nanotechnology (C2N)
15 Rue Georges Clémenceau, 91405 Orsay Cedex
Tel: +33 1 69 15 78 65
Website: www.c2n.universite-paris-saclay.fr/en/

Université Paris-Sud - Centre for Nanoscience and Nanotechnology (C2N)

Typical periodicity-graded GPH surface-emitting THz laser

Optimal intersubband polariton-dispersion diagram

Typical dispersion diagram

Diagram of a lithographically tunable LC resonator

Reflectivity spectra of a sample