Dynamic control of coherent pulses via destructive interference in graphene under Landau quantization

Abstract

We analyze the destructive interference in monolayer graphene under Landau quantization in a time-dependent way by using the Bloch-Maxwell formalism. Based on this analysis, we investigate the dynamics control of an infrared probe and a terahertz (THz) switch pulses in graphene. In presence of the THz switch pulse, the destructive interference take places and can be optimized so that the monolayer graphene is completely transparent to the infrared probe pulse. In absence of the THz switch pulse, however, the infrared probe pulse is absorbed due to such a interference does not take place. Furthermore, we provide a clear physics insight of this destructive interference by using the classical dressed-state theory. Conversely, the present model may be rendered either absorbing or transparent to the THz switch pulse. By choosing appropriate wave form of the probe and switch pulses, we show that both infrared probe and THz switch pulses exhibit the steplike transitions between absorption and transparency. Such steplike transitions can be used to devise a versatile quantum interference-based solid-state optical switching with distinct wave-lengths for optical communication devices.

Control of slow light in three- and four-level graphene nanostructures

“…In the calculation, the other parameters are taken as the electron number density N = 5×10 16 m −2 , the dielectric constant ε = 4.5, the transition dipole moment µ 21 = 1.602176565×10 −27 C•m. 57,58 In the following, the other parameters are all evaluated by the decay rates γ 21 = γ 23 = γ. It can be seen that, one EIT window appears and its position can be controlled by the detuning of the control field.…”

Nonlinear magneto-optic effects in doped graphene and in gapped graphene: A perturbative treatment

“…appearing in the denominator of the expression in Eq. (24). When E s1s2 (w, n, m) = 0, the optical transitions are in resonance, and third order nonlinear conductivity may diverge.…”

“…13,15 In the latter work, a giant bulk effective optical susceptibility χ (3) eff ∼ 5 × 10 −9 /B(T ) m 2 /V 2 was predicted in full resonant conditions; it was recently experimentally demonstrated by König-Otto et al in the far infrared. 22 The use of the strong optical nonlinearity of such systems has been suggested for generating entangled photons, 14 for constructing all-optical switches 23 and tunable lasers, 22 for the dynamic control of coherent pulses, 24 and for the demonstration of optical bistability and optical multistability. 25,26 Theoretical treatments in literature include Fermi's golden rule, 16 dynamics in the framework of equation of motion, [13][14][15][22][23][24][25][26] and direct solutions of the Schrödinger equation 27 by using numerical simulation or by employing the rotating wave approximation.…”

“…22 The use of the strong optical nonlinearity of such systems has been suggested for generating entangled photons, 14 for constructing all-optical switches 23 and tunable lasers, 22 for the dynamic control of coherent pulses, 24 and for the demonstration of optical bistability and optical multistability. 25,26 Theoretical treatments in literature include Fermi's golden rule, 16 dynamics in the framework of equation of motion, [13][14][15][22][23][24][25][26] and direct solutions of the Schrödinger equation 27 by using numerical simulation or by employing the rotating wave approximation. These studies focus mostly on the transitions between the lowest few LLs, and ignore the contributions from other LLs, because the photon energies are close to the resonant transition energies.…”

Nonperturbative model for optical response under intense periodic fields with application to graphene in a strong perpendicular magnetic field

“…[2][3][4][5][6][7] A huge optical susceptibility is predicted by Yao and Belyanin 3,4 and confirmed by the four wave mixing (FWM) experiments of König-Otto et al in the far infrared. 5 Proposed applications for graphene-based photonics include the generation of entangled photons, 8 an all-optical switch, 9 tunable lasers, 6 the dynamic control of coherent pulses, 10 and the demonstration of optical bistability and optical multistability. 11,12 Theoretically, optical nonlinearities are mostly studied in an equation-of-motion framework, where solutions of the dynamical equations can be obtained in the rotating wave approximation (RWA) 3,4 or in perturbation method.…”