Frontiers of Optoelectronics, Volume. 8, Issue 1, 1(2015)
Nonlinear optical response of graphene in terahertz and near-infrared frequency regime
In this review, we discuss our recent theoretical work on the nonlinear optical response of graphene and its sister structure in terahertz (THz) and near-infrared frequency regime. Due to Dirac-like linear energymomentum dispersion, the third-order nonlinear current in graphene is much stronger than that in conventional semiconductors. The nonlinear current grows rapidly with increasing temperature and decreasing frequency. The third-order nonlinear current can be as strong as the linear current under moderate electric field strength of 104 V/cm. In bilayer graphene (BLG) with low energy trigonal warping effect, not only the optical response is strongly nonlinear, the optical nonlinearity is well-preserved at elevated temperature. In the presence of a bandgap (such as semihydrogenated graphene (SHG)), there exists two well separated linear response and nonlinear response peaks. This suggests that SHG can have a unique potential as a two-color nonlinear material in the THz frequency regime where the relative intensity of the two colors can be tuned with the electric field. In a graphene superlattice structure of Kronig-Penney type periodic potential, the Dirac cone is elliptically deformed. We found that not only the optical nonlinearity is preserved in such a system, the total optical response is further enhanced by a factor proportional to the band anisotropy. This suggests that graphene superlattice is another potential candidate in THz device application.
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Yee Sin ANG, Qinjun CHEN, Chao ZHANG. Nonlinear optical response of graphene in terahertz and near-infrared frequency regime[J]. Frontiers of Optoelectronics, 2015, 8(1): 1
Category: REVIEW ARTICLE
Received: Mar. 16, 2014
Accepted: Jul. 18, 2014
Published Online: Apr. 20, 2015
The Author Email: ZHANG Chao (czhang@uow.edu.au)