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Chinese Physics Letters

Slow Light by Modified Reservoir Induced Transparency with a Non-Singular Density of Modes

周博, 杜春光, 李师群

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

We investigate the dispersive property of a A-type atomic system embedded in photonic band gap structures. The atomic coherence is established by the structured reservoir which consists of a double-band photonic band gap (PBG) and defect modes. With an atomic density of 7×10^15 atoms/cm^3, the group velocity of a probe laser being detuned far away from the gap is shown to be reduced to 3×10^2 m/s near the transparency window associated with the PBG edges and 6×10^3 m/s at the transparency window associated with the defect modes, without using any deriving field. The influence of the smoothness of the density of modes and the decay rate of the second ground state of atoms are analysed.

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We investigate the dispersive property of a A-type atomic system embedded in photonic band gap structures. The atomic coherence is established by the structured reservoir which consists of a double-band photonic band gap (PBG) and defect modes. With an atomic density of 7×10^15 atoms/cm^3, the group velocity of a probe laser being detuned far away from the gap is shown to be reduced to 3×10^2 m/s near the transparency window associated with the PBG edges and 6×10^3 m/s at the transparency window associated with the defect modes, without using any deriving field. The influence of the smoothness of the density of modes and the decay rate of the second ground state of atoms are analysed.
We investigate the dispersive property of a Λ-type atomic system embedded in photonic band gap structures. The atomic coherence is established by the structured reservoir which consists of a double-band photonic band gap (PBG) and defect modes. With an atomic density of 7×10 15 atoms/cm 3 , the group velocity of a probe laser being detuned far away from the gap is shown to be reduced to 3×10 2 m/s near the transparency window associated with the PBG edges and 6×10 3 m/s at the transparency window associated with the defect modes, without using any deriving field. The influence of the smoothness of the density of modes and the decay rate of the second ground state of atoms are analysed.
The absorption–dispersion properties of a microwave-driven five-level atom embedded in an isotropic photonic bandgap (PBG) have been studied. Due to the singular density of modes (DOM) in the isotropic PBG and the dynamically coherence induced by the coupling fields, modified reservoir-induced transparency and quantum interference-induced transparency emerge simultaneously. Their interaction leads to ultra-narrow spectral structure. As a result of closed-loop configuration, these features can be manipulated by the amplitudes and relative phase of the coherently driven fields. The position and width of PBG also have an influence on the spectra. The theoretical studies can provide us with more efficient methods to control the atomic absorption–dispersion properties, which have applications in optical switching and slow light.
We analytically and numerically investigate the response of an open Λ-type atomic system to a probe laser field, where one of the atomic transition is coupled with a double-band radiation reservoir and high- Q defect modes formed by atomic doping. This system can be transparent to a weak probe field being two-photon resonant with the frequency of the defect modes or one of the two band edges, and the high- Q defect modes can even induce an atom–field coherent population trapping (CPT) state without involving the excited state of the atom, in spite of the background decay of the excited state of the atom. The steady-state properties of this CPT are independent of the smoothness feature of the density of modes (DOM) at band edges. However, the CPT never occurs in the absence of any defect even if the DOM is singular at both band edges. We also find that the background decay of the second ground state of the atom will destroy the CPT and increase the probe absorption, but the atomic coherence induced by the defect modes is more robust than that induced by the band edges. The transient properties of the CPT are also studied.
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.
The probe absorption-dispersion spectra of a radio-frequency (RF)-driven five-level atom embedded in a photonic crystal are investigated by considering the isotropic double-band photonic-band-gap (PBG) reservoir. In the model used, the two transitions are, respectively, coupled by the upper and lower bands in such a PBG material, thus leading to some curious phenomena. Numerical simulations are performed for the optical spectra. It is found that when one transition frequency is inside the band gap and the other is outside the gap, there emerge three peaks in the absorption spectra. However, for the case that two transition frequencies lie inside or outside the band gap, the spectra display four absorption profiles. Especially, there appear two sharp peaks in the spectra when both transition frequencies exist inside the band gap. The influences of the intensity and frequency of the RF-driven field on the absorptive and dispersive response are analyzed under different band-edge positions. It is found that a transparency window appears in the absorption spectra and is accompanied by a very steep variation of the dispersion profile by adjusting system parameters. These results show that the absorption-dispersion properties of the system depend strongly on the RF-induced quantum interference and the density of states (DOS) of the PBG reservoir.