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Acta Physica Sinica

Dynamic properties of a Λ-type atom embedded in photonic crystal

Huang Xian-Shan, Yang Ya-Ping, 同济大学物理系，上海 200092

Published Jan 1, 2005• 1 citation
Publisher

Abstract

The dynamical properties and spectrum characteristics of a Λ-type atom with an external field embedded in three-dimensional photonic crystals are investigated . With the help of numerical calculation and theoretical analysis, we find that the populations of the upper and lower levels display quasi-oscillation, and the frequency and amplitude of the oscillation is greatly affected by the intensity of the external-driving field Ω, the detuning δ and the background decay of the upper level γ. Ｓpontaneous emission of the atom is apparently influenced by the relative position of the upper level from the forbidden gap. Furthermore, the properties of the emission field around the atom are analyzed by means of s pontaneous emission spectrum.

DOI
10.7498/aps.54.4129

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The dynamical properties and spectrum characteristics of a Λ-type atom with an external field embedded in three-dimensional photonic crystals are investigated . With the help of numerical calculation and theoretical analysis, we find that the populations of the upper and lower levels display quasi-oscillation, and the frequency and amplitude of the oscillation is greatly affected by the intensity of the external-driving field Ω, the detuning δ and the background decay of the upper level γ. Ｓpontaneous emission of the atom is apparently influenced by the relative position of the upper level from the forbidden gap. Furthermore, the properties of the emission field around the atom are analyzed by means of s pontaneous emission spectrum.
The dynamical properties and spectrum characteristics of a-type atom with an external field embedded in threedimensional photonic crystals are investigated.With the help of numerical calculation and theoretical analysis,we find that the populations of the upper and lower levels will display periodic oscillation,and the frequency and amplitude of the oscillation will be greatly affected by the intensity of the external-driving field,the detuning.The spontaneous emission of the atom will be apparently influenced by the relative position of the upper level from the forbidden gap.
The spontaneous emission properties of a Λ_type atom embedded in anisotropic photonic crystals are investigated. We find that the dynamical properties of the atom and the propagating characteristics of the radiation field are obviously influenced by the relative position of the upper level from the forbidden gap and the space between the two lower levels. With the help of numerical calculation and theoretical analysis, we plot the evolution of the total radiation field and its components with the time. Furthermore, we also study the influence of photonic crystals on radiative properties of the atom by means of spontaneous emission spectrum.
Dynamic and radiative properties of a Λ-type atom embedded in a three-dimensional anisotropic photonic crystal with a driven field are investigated. The time-evolution properties of the atom and the characteristics of the emission field are greatly affected by the position of the upper level relative to the forbidden gap. Also studied are the influence of the intensity of the external field, the detuning from resonant frequency, and the background decay parameter on the dynamic properties of the atom. The energy of the propagation field is translated partly into the form of the diffusion field during the propagating process. The spectra of the propagation component and diffusive component are dependent on the distance from the atom.
The radiative characteristics and the decay properties of a Λ-type excited atom embedded in anisotropic photonic crystals are studied. It is found that the dynamic properties of the atom and the propagating characteristics of the emitted field are apparently influenced by the relative position of the upper level from the forbidden gap and the two lower levels. By Von Neumann measurement, the effects of measurements on the decaying atom are investigated. The frequent projection on the excited state can lead to decay suppression or an acceleration effect at rather low repetition rates, depending on the frequency of measurements and the relative position of the upper level from the photonic crystals band edge.
We have studied the spontaneous emission from a three-level atom with an external-driving field in a photonic crystal. As a result of quantum interference and photon localization, the population in the two upper levels displays quasi-oscillatory or oscillatory behavior. This depends on the initial atomic state and the relative positions of the two upper levels from the forbidden gap. The intensity and the phase of the external field can affect spontaneous emission from the atom. The properties are different from a three-level atom either in vacuum or in a photonic crystal without an external driving field.