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

Journal Article · Wed Oct 15 00:00:00 EDT 2014 · AIP Advances

DOI:https://doi.org/10.1063/1.4900487· OSTI ID:22300232

Tang, Linlong ^[1]; Du, Jinglei ^[1]; Shi, Haofei; Wei, Dongshan; Du, Chunlei ^[2]

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1. Key Laboratory of High Energy Density Physics and Technology, College of Physics and Technology, Sichuan University, Chengdu, 610064 (China)
2. Chongqing institute of green and intelligent technology, Chinese Academy of Sciences, Chongqing, 401122 (China)

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.

• OSTI ID: 22300232
• Journal Information: AIP Advances, Vol. 4, Issue 10; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
GAIN
GRAPHENE
LAYERS
STIMULATED EMISSION