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Title: Strong coupling and stimulated emission in single parabolic quantum well microcavity for terahertz cascade

We report observation of strong light-matter coupling in an AlGaAs microcavity (MC) with an embedded single parabolic quantum well. The parabolic potential is achieved by varying aluminum concentration along the growth direction providing equally spaced energy levels, as confirmed by Brewster angle reflectivity 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 devices for creating cascaded relaxation of bosons, which could be utilized for THz emission.
Authors:
;  [1] ;  [2] ; ;  [3] ; ;  [4] ;  [4] ;  [2] ;  [3] ;  [5]
  1. Department of Materials Science and Technology, University of Crete, 71003 Heraklion, Crete (Greece)
  2. (Greece)
  3. Spin Optics Laboratory, State University of Saint-Petersburg, 1 Ulianovskaya, 198504 St. Petersburg (Russian Federation)
  4. Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, 71110 Heraklion, Crete (Greece)
  5. (United Kingdom)
Publication Date:
OSTI Identifier:
22482020
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM ARSENIDES; COUPLING; ENERGY LEVELS; GALLIUM ARSENIDES; QUANTUM WELLS; REFLECTIVITY; SPECTROSCOPY; STIMULATED EMISSION; THZ RANGE 01-100; TIME RESOLUTION