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Title: Room temperature broadband terahertz gains in graphene heterostructures based on inter-layer radiative transitions

We exploit inter-layer radiative transitions to provide gains to amplify terahertz waves in graphene heterostructures. This is achieved by properly doping graphene sheets and aligning their energy bands so that the processes of stimulated emissions can overwhelm absorptions. We derive an expression for the gain estimation and show the gain is insensitive to temperature variation. Moreover, the gain is broadband and can be strong enough to compensate the free carrier loss, indicating graphene based room temperature terahertz lasers are feasible.
Authors:
 [1] ;  [2] ;  [1] ; ; ;  [3]
  1. Key Laboratory of High Energy Density Physics and Technology, College of Physics and Technology, Sichuan University, Chengdu, 610064 (China)
  2. (China)
  3. Chongqing institute of green and intelligent technology, Chinese Academy of Sciences, Chongqing, 401122 (China)
Publication Date:
OSTI Identifier:
22300232
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 10; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; GAIN; GRAPHENE; LAYERS; STIMULATED EMISSION