Tuesday, September 8, 2015
Abstract-Strong coupling and stimulated emission in single parabolic quantum well microcavity for terahertz cascade
We report observation of strong light-matter coupling in an (MC) with an embedded single parabolic The parabolic potential is achieved by varying concentration along the direction providing equally spaced energy levels, as confirmed by Brewster angle from a reference sample without MC. It acts as an active region of the structure which potentially allows cascaded emission of terahertz (THz) light. Spectrally and time resolved pump-probe spectroscopy reveals characteristic quantum beats whose frequencies range from 0.9 to 4.5 THz, corresponding to energy separation between relevant excitonic levels. The structure exhibits strong stimulated nonlinear emission with simultaneous transition to weak coupling regime. The present study highlights the potential of such for creating cascaded relaxation of bosons, which could be utilized for THz emission.