期刊
APPLIED PHYSICS LETTERS
卷 97, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3462972
关键词
elemental semiconductors; graphene; microwave photonics; nonlinear optics; optical conductivity; p-n junctions; terahertz wave generation
资金
- National Basic Research Program of China [2007CB310402]
- National Natural Science Foundation of China [60721004]
- Chinese Academy of Sciences
- Shanghai Municipal Commission of Science and Technology [10JC1417000]
- [KGCX1YW-24]
- [KGCX2-YW-231]
We show that the optical responses of a graphene pn junction is dominated by nonlinear intraband and interband processes. At the experimentally relevant electric field intensity, nonlinear conductance is an order of magnitude larger than the linear conductance. Furthermore, the total conductance is negative in the terahertz to far infrared regime. The negative conductance provides a unique mechanism for photon generation in graphene and could be used for developing coherent terahertz radiation sources. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3462972]
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