Optical bistability in reflection of the laser pulse in a 1D photonic crystal doped with four-level InGaN/GaN quantum dots

Abstract

The present study aimed to evaluate the optical properties of 1D photonic crystal (PC) with a defect layer doped by four-level InGaN/GaN quantum dots. Transient and steady-state behavior of the medium completely relies on the intensities and relative phases of coherent coupling fields. In addition, the transient absorption–dispersion spectra of 1DPC can be easily adjusted by choosing the controllable parameters properly. Furthermore, the transmitted and reflected light pulses at λ = 1.55 μ m (long wavelength) can be tuned by controlling the Rabi frequencies of applied light due to their potential applications in all-optical systems. Furthermore, the effect of relative phase between applied fields on the light propagation was evaluated through the medium. In addition, all-optical switching time was found for subluminal/superluminal and absorption/transmission of light propagation. The required switching time ranges between 2–7 ps. The proposed model may provide some new possibilities for technological applications in optoelectronics and solid-state quantum information science and systems due to large applications in signal processing.

Three-dimensional control of the light propagation in a defect photonic crystal

“…. (25) To distinguish between the real and imaginary components of r(ω) and t(ω), we express them in the form t(ω) = |t(ω)| exp[iϕ t (ω)] and r(ω) = |r(ω)| exp[iϕ r (ω)] respectively, where the real functions ϕ t,r (ω) correspond to the phases of the transmission and reflection coefficients. The phase times for transmitted and reflected pulses can be computed using the relation τ r,t (ω) = ∂ϕ r,t / ∂ω [33].…”

“…They found that by adjusting the optical parameters of the system, the reflection and transmission lights can be tuned in different thickness of the defect layer. Controlling the optical bistability and optical multistability in a defect 1DPC doped by four-level quantum dot have been studied by Shiri et al [25]. They discussed the intensity of the coupling light on the optical bistability threshold of the reflected light.…”

Diffraction grating via position dependent incident light in a closed-loop quantum system

“…spontaneously generated coherence (SGC) [7], high refractive index [8], and many more surprising effects [9][10][11][12][13][14][15][16][17]. Because of this, EIT has been examined in a variety of different architectures, including multilevel atoms and semiconductor quantum well (QW) nanostructures, respectively [18][19][20][21]. The opacity number one system will turn transparent via quantum interference due to coherent states in a standard three-level EIT system because of the use of a strong coherent pair field.…”

Two-dimensional realization of electromagnetically induced phase grating in a quantum dot nanostructure

“…This endeavor presently stands as the ultimate objective of most telecommunication research [7,[11][12][13]. In recent times, quantum wells or coupled-quantum wells and coupled-quantum dots (CQDs) have predominantly been employed for the development of all-optical systems [14][15][16][17]. These materials possess properties similar to atomic vapors, such as discrete energy levels, and offer advantages such as large electric dipole moments and high nonlinear optical coefficients.…”