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Journal of Physics B Atomic Molecular and Optical Physics

Optical properties of an adatom near a surface of a small metallic particle

X Li, C Gong

Published Apr 28, 1988• 2 citations
Publisher

Abstract

Optical properties of an adatom adsorbed near a surface of a small metallic particle are investigated by means of the reservoir theory, Dekker's (1979) quantisation procedure and the modified image theory. Surface-induced lifetime and Lamb shift as well as the resonance fluorescence spectrum are discussed. Size effects as well as the distance between the adatom and the particle surface are fund to play an important role.

DOI
10.1088/0953-4075/21/8/016

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Acta Optica Sinica•Jan 1, 1987•0 citations
Optical properties of an adatom adsorbed near a surface of a small metallic particle are investigated by means of the reservoir theory, Dekker's (1979) quantisation procedure and the modified image theory. Surface-induced lifetime and Lamb shift as well as the resonance fluorescence spectrum are discussed. Size effects as well as the distance between the adatom and the particle surface are fund to play an important role.
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.
The resonance fluorescence spectrum of two atoms near a perfectly conducting metal is investigated. A quantum-mechanical version of the image method, taking into account the dipole-dipole interaction, is adopted to study the excitation spectrum. Within the framework of this approach, each single atom and its corresponding image are kinematically correlated, while dynamically they are actually independent. The effects of the surface are directly exhibited in the decay rates, the frequency shift, and the spectrum. The influence of the surface is found to be large for weak fields but becomes very small for high intensities of the pump field.
A derivation of surface-dressed optical Bloch equations, involving a treatment of surface-reflected photons and a surface plasmon resonance, is presented for a collision-damped two-level atom near or adsorbed on a metal surface. Effects of the laser bandwidth are included by means of a phase-diffusion model for the driving field. In the weak-field or large detuning limit, the population inversion and resonance fluorescence spectrum are obtained analytically. These quantities along with the surface-induced phase-decay constant of the adatom show strong oscillatory behavior as a function of the adatom-surface distance.
A derivation of surface-dressed optical Bloch equations, involving a treatment of surface-reflected photons and a surface plasmon resonance, is presented for a collision-damped two-level atom near or adsorbed on a metal surface. Effects of the laser bandwidth are included by means of a phase-diffusion model for the driving field. In the weak-field or large detuning limit, the population inversion and resonance fluorescence spectrum are analytically obtained. These quantities along with the surface-induced phase-decay constant of the adatom show strong oscillatory behavior as a function of the adatom–surface distance.
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.