Giant intersubband polariton splitting in InAs/AlSb microcavities

A.A. Anappara , D. Barat (1) , A. Tredicucci , J. Devenson (1) , R. Teissier (1, 2) , A. N. Baranov (1, 2)

1 IES - Institut d’Electronique et des Systèmes
2 NANOMIR - Composants à Nanostructure pour le moyen infrarouge

The optical response of the intersubband excitation of multiple InAs/AlSb quantum wells embedded in a planar semiconductor microcavity has been studied through angle-dependent reflectance measurements. Using a resonator based on total internal reflection, a strong coupling is demonstrated between the intersubband optical transition and the cavity photon, with the attendant formation of intersubband polaritons. A giant vacuum-Rabi splitting 2ΩR was observed both at liquid helium temperatures (View the MathML source) as well as at 300 K (View the MathML source), for a transition energy View the MathML source. The observed ratio View the MathML source is a record high value (14%) for any strongly-coupled systems, and demonstrates the huge potential of this material for the achievement of the ultra-strong coupling regime predicted theoretically.

Mots clés: Intersubband transitions; Semiconductors; Optical properties; Polaritons

Domaines: Electronique

A.A. Anappara, D. Barat, A. Tredicucci, J. Devenson, R. Teissier, et al.. Giant intersubband polariton splitting in InAs/AlSb microcavities. Solid State Communications, 2007, 142 (6), pp.311-313. ⟨10.1016/j.ssc.2007.03.006⟩. ⟨hal-00327763⟩