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Acta Physica Sinica

RESONANCE FLUORESCENCE OF AN ADATOM NEAR THE SURFACE OF A PERIODIC OR QUASI-PERIODIC SUPERLATTICE FILM

Xiao-shen Li, GONG CHANG-DE, (1)南京大学物理系,中国科学院上海冶金研究所; (2)中国高等科学技术中心(世界实验室)理论物理中心,南京大学物理系

Published Jan 1, 1988• 0 citations
Publisher

Abstract

Resonance fluorescence spectrum and squeezing phenomenon are studied for an adatom near the surface of a periodic or quasi-periodic superlattice film using the surface-dressed optical Bloch equations. The influences of thickness and dielectric properties of each layer composing this film, number of layers, and geometry structures are discussed.

DOI
10.7498/aps.37.1415

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Acta Optica Sinica•Jan 1, 1987•0 citations
Resonance fluorescence spectrum and squeezing phenomenon are studied for an adatom near the surface of a periodic or quasi-periodic superlattice film using the surface-dressed optical Bloch equations. The influences of thickness and dielectric properties of each layer composing this film, number of layers, and geometry structures are discussed.
The surface-dressed optical Bloch equations and the Maxwell equations are combined consistently to obtain spontaneous decay rates and frequency shifts for an atom near the surface of a superlattice film with periodic or quasi-periodic structure. The effects of the number, thickness and dielectric properties of the layers constructing this film on the spontaneous emission properties are discussed. The results for the two different cases of periodic structure and quasi periodic structure are comparable.
Spontaneous-emission properties and resonance fluorescence for a two-level adatom near the surface of a semi-infinite superlattice with quasiperiodic structure are studied by use of surface-dressed optical Bloch equations and Maxwell's equations. Effects of dielectric properties and the geometric structure of this superlattice on spontaneous-decay rate and frequency shift, resonance-fluorescence spectrum, time evolution of adatomic inversion, and fluctuations of the dipole moment for this adatom are discussed and some novel phenomena are discovered.
By using the reservoir theory and Dekker's quantization procedure for a dissipation system, a set of new surface-dressed optical Bloch equations including the surface-induced frequency shift as well as the decay rate is derived to calculate the resonance fluorescence spectrum of an adatom near a bulk solid surface. A mediate layer composed of nonabsorbing dielectric is placed to separate the adatom and the bulk solid. The size and the dielectric effects of this layer are found to be as important as those effects from the bulk solid. These effects will be directly exhibited in the decay rates and the frequency shifts. The resonance fluorescence spectrum is discussed in different cases and is found to be strongly affected by the surfaces.
By means of the linear response method, the surface-dressed optical Bloch equations (SBE) for atoms absorbed on a solid surface are obtained. These SBE are different from the earlier oxies. The difference-lies in the fact that here the influences of the solid surface on the spontaneous decay rate and the Lamb shift of the adsorbed atoms have been taken into account. Using the SBE and the regression theorem, the resonance fluorescence spectrum for the adatoms are obtained. Through analyzing these spectrum numerically, it is found that the solid surface will exert a significant influences both on the sidebands and peak hights. Namely, when the adatoms approach the surface, the distance between the two sidebands will become larger and the height for each peak will go down until the peaks disappear one by one.