Mid-infrared Otto excitation of transverse electric modes in doped graphene

作者：Ramos Mendieta F^*

来源：Journal of Applied Physics, 2015, 117(13): 133101.

DOI：10.1063/1.4916721

We have studied numerically the excitation of surface modes of transverse electric polarization in doped graphene. Using the prism-based Otto configuration, the electromagnetic resonances were found within ultra-tiny angular windows of width of order of Delta theta(i) = 10(-3) degrees or lower, beyond the critical angle where evanescent fields are already available. We obtained absorption peaks of angular position strongly dependent on the prism-graphene separation d, which is larger than d(c), the cutoff prism-graphene separation. We prove numerically that dc depends on the graphene parameters and can be written as d(c) = alpha/2, where alpha(omega) is the decay length of the electromagnetic field of the modes. With doping levels of Fermi energy 0.2 eV <= mu <= 0.3 eV, we found resonances within the range of 80-145 THz. The numerical calculations show the mayor role played by the graphene losses that, indeed, can obliterate the mode resonance.

• 出版日期2015-4-7