期刊
OPTICS EXPRESS
卷 24, 期 3, 页码 2877-2884出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.24.002877
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资金
- National Natural Science Foundation of China [11304275, 11164034]
- Yunnan Provincial Department of Education [2013Z013]
- Yunnan Province Natural Science Foundation [2010DC053]
- Key Applied Basic Research Program of Science Technology Commission Foundation of Yunnan Province [2013FA035]
- Innovative Talents of Science and Technology Plan Projects of Yunnan Province [2012HA007, 2014HB0010]
We investigate theoretically the size-dependence of two-photon absorption (TPA) for circular graphene quantum dots (GQDs) on the basis of electronic energy states obtained by solving the Dirac-Weyl equation analytically under infinite-mass boundary condition. The analytical expressions for TPA coefficient are derived with an arbitrary size-distribution and the transition selection rules are obtained. Results reveal that the intraband transitions in conduction band and valence band contribute much more to TPA than interband transitions. The energy spectrum and TPA peaks are tuned by the size of GQDs. (C) 2016 Optical Society of America
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