Absorption of THz electromagnetic wave in two mono-layers of graphene

Hidden symmetries inN-layer dielectric stacks

“…We assume that the incident light I is normal to the sur face of the layer. The reflectance and transmittance of light, R and T respectively, can be calculated by the transfer matrix method [22,26]. By using the transfer matrix method, we can relate the electromagnetic (EM) fields of light between any two different positions without knowing the multiple reflec tion processes between them in detail.…”

“…The product of M 0 P 1 in Eq. ( 8) is known as the transfer matrix [22]. This transfer matrix describes the propagation of incident light from vacuum L 0 through L 1 .…”

“…One can also realise perfect dielectric mirrors based on a multilayer stack, which are known as Bragg reflectors [6,[14][15][16], as well as structures based on them called Bragggrating filters [17][18][19][20]. Furthermore, if one adds a conducting layer inside the multilayer stack, such as metal or graphene, one can also control the absorption of light intensity as a function of Fermi energy of the metal layer [21][22][23][24], and we can expect enhance ment of absorption due to the high electric field enhancement inside the multilayer system. However, these previous studies focus only on certain specific sequences of dielectric media, such as alternating and periodic sequences, or Fibonacci and Cantor sequences [8][9][10][11]25].…”

Linear and nonlinear optical propagation in 2D materials

“…The latter is very eff ective when, as in our case, we are mainly interested in an input-output description of the structure. It has already been used in the present context [137][138][139]. Assuming N two-dimensional materials inside a multilayer dielectric media, spaced apart from each other by a distance = z d , the wave-amplitude transmission matrix method [140] relates the electromagnetic fi elds at all interfaces in a multi-layered system.…”

Quantum Description of Surface Plasmon Excitation by Light in Graphene

“…Surface plasmon is a collective motion of electrons whose electric fields both lie in the direction perpendicular to the plane denoted by and in the direction parallel to a wave vector denoted by , which is in the direction of plane as shown in Figure . As far as we consider sufficiently small frequency of EM wave compared with the inverse of the relaxation time of an electron in the Drude conductivity, such as gigahertz (GHz) or terahertz (THz) in the case of doped graphene, the alternating electric current density induced by the electric field of EM wave should be equivalent to the surface current density of the surface plasmon. It is why we can reproduce the experimental observation of THz EM wave absorption of monolayer graphene by solving the Maxwell equations .…”