Probe absorption–dispersion spectra of a driven three-level atom in a double-band photonic crystal

Abstract

The probe absorption-dispersion spectra of a driven three-level atom in a double-band photonic crystal have been investigated. We use the model which assumes the upper levels of the atomic transitions coupled via a classical driving field. One of the transitions interacts with the free vacuum modes, and the other transition couples to the modes of the modified reservoir (photonic band gap). The effect of the classical driving field on the absorption-dispersion spectra of an atom is investigated in detail. Most interestingly, it is shown that the atom becomes transparent to a probe laser field coupled to the free space transition, and slow group velocities are obtained near the transparency window.

Entanglement of a two-level atom and its spontaneous emission near the edge of a photonic band gap

“…The steady-state entanglement between the atom and its spontaneous emission field can be easily found by inspection of Eqs. (17), (25) as:…”

“…From the point of view of the surrounding environment of atoms, photonic band gap (PBG) structures have been shown to have different DOS compared with a free space vacuum field [16]. PBG structures offer unique ways to tailor light and the propagation of electromagnetic waves and have caused growing interest in recent years because it offers the possibility of controlling and manipulating light within a given frequency range through PBG [17]. In this Letter, we are going to study the entanglement between a two-level atom and its spontaneous emission fields near a photonic band edge by using quantum entropy.…”

“…(17), one member of the doublet is pulled into the gap with frequency located at ω c − β|x 1 | 2 . The corresponding dressed state is the atom-photon bound dressed state with no-decay.…”

Amplitude and phase controlled absorption and dispersion of coherently driven five-level atom in double-band photonic crystal

“…By studying the probe absorption-dispersion spectra of a driven threelevel atom, Roshan et al found that the atom is transparent to a probe laser field coupled to the free space transition and slow group velocities can be obtained near the transparency window. [22] Meanwhile, for a double V-type atom in a PBG structure, there are three types of transparency in the spectra, and it was shown that the absorption and dispersion properties of the system depend on the two types of quantum interference and DOM of the modified reservoir. [23] Du and co-workers investigated the dispersion and absorption of three-level atoms, and found that high-Q defect mode can induce transparency window in the absorptive spectra and lead to slow light.…”

Susceptibility of a two-level atom near an isotropic photonic band edge: Transparency and band edge profile reconstruction

“…The majority of contributions regarding radiative properties consider only spontaneous emission of two, three, four and five level atoms embedded in a PBG structure [20,22,31,32,36,37], with only a few exceptions treating absorptive and dispersive properties [21,38]. As an important example of this last case, the absorption and dispersion properties of a Λ-type atom decaying spontaneously near the edge of a PBG was studied [21].…”