High-efficiency infrared four-wave mixing signal in monolayer graphene

In this paper, we suggest a theoretical model for the exchange of the orbital angular momentum (OAM) state of laser fields in a real cold atomic system for realization in an experimental setup. By using four-wave mixing (FWM) processes, we study the spatial dependence of the new weak generated signal light under electromagnetically induced transparency conditions when one of the laser lights becomes an optical vortex. We discuss the spatial dependence of FWM processes via experimental parameters for different conditions of the OAM of vortex light. We have found that the intensity and phase distributions of the new generated light depends strongly on the OAM number of the optical vortex light. Moreover, we investigate the absorption spectrum of the new generated signal light for different OAM of the optical vortex light. Our obtained results may have potential applications in quantum information science.

Section: Introductionmentioning

confidence: 99%

A five-level cold atomic system for the orbital angular momentum exchange based on a four-wave mixing setup

Ali,

Kamona,

Hussein

et al. 2023

“…Electromagnetically induced transparency (EIT) is a fascinating quantum optics phenomenon that occurs when a strong coupling field interferes with a weak probe field, causing its absorption to vanish [1]. This effect has found applications in numerous domains, including optical bistability [2,3], enhanced Kerr nonlinearity [4], and optical solitons [5,6], four-wave mixing (FWM) [7,8] and so on [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Operating mode dependent energy transfer efficiency in a quantum well waveguide

Al-Dolaimy,

Kzar,

Jamil

et al. 2023

In this paper, we delve into the intricate interplay between optical fields with varying relative phases in a closed-loop configuration semiconductor quantum well waveguide with four distinct energy levels, and how it impacts the Fraunhofer diffraction patterns obtained via four-wave mixing. By harnessing a strong control field, a standing wave driving field, and two weak probe and signal fields, we drive the waveguide to generate these patterns with maximum efficiency. To achieve this, we consider three distinct light-matter interaction scenarios, where the system is first set up in either a lower electromagnetically induced transparency or a coherent population trapping state, followed by a final state that enables electron spin coherence (ESC) induction. Our results reveal that the efficiency of Fraunhofer diffraction in the quantum well waveguide can be enhanced significantly under specific parameter regimes via the spin coherence effect. Further investigation of the light-matter interaction in the ESC zone, where only one of the control fields is a standing wave field, demonstrates that spin coherence facilitates more efficient transfer of energy from the probe light to the third and fourth orders, highlighting its crucial role in shaping the diffraction patterns.

“…Recently, it has been demonstrated that a single-layer graphene nanostructure under a strong magnetic field, due to the unique properties of quantized electron states and optical selection rules near the Dirac point, is suitable for observations of nonlinear optical phenomena [9,10,[35][36][37][38][39][40][41]. For example, the giant optical nonlinearity of graphene using the quantum mechanical density-matrix formalism has been calculated in the mid-or far-infrared optical region [35].…”

Section: Introductionmentioning

confidence: 99%

Phase manipulation of Goos–Hänchen shifts in a single-layer of graphene nanostructure under strong magnetic field

Solookinejad¹,

Jabbari²,

Panahi³

et al. 2017

In this paper, we discuss the phase management of Goos-Hänchen (GH) shifts of a probe light through a cavity with a single-layer graphene nanostructure under a strong magnetic field. By using the quantum mechanical density matrix formalism we study the GH shifts of reflected and transmitted light beams. It is realized that negative or positive GH shifts can be achieved simultaneously by tuning some controllable parameters such as relative phase and the Rabi frequency of the applied fields. Moreover, the thickness effect of the cavity structure is considered as an effective parameter for adjusting the GH shifts of reflected and transmitted light beams. We find that by choosing suitable parameters, a maximum negative shift of 4.5 mm and positive shift of 5.4 mm are possible for GH shifts in reflected and transmitted light. Our proposed model may be useful for developing all-optical devices in the infrared region.