Sub-half-wavelength localization

In this present article, we will give a brief review of some of our recent research work related to atomic localization via the effects of atomic coherence and quantiun interferences atom localization based on double-dark resonance effects [23,24], sub-half-wavelength local ization via two standing-wave fields [27], as well as its application in atom nano-lithograph[28]. Then we will introduce some of our recent related work in quantum well systems[62,63]. 

Sub-half-wavelength localization via two standing-wave fields... 

Then we turn to the localization precision problem, which is shown by the width of the localization peak. In Fig. 8, we plot the normalized imaginary part of the susceptibility versus the normalized position X under the condition that sub-half-wavelength localization has occurred. 

In this article we reviewed some of oiu recent research work related to atomic localization via the effects of atomic coherence and quantum interferences. It was found that the localization property was significantly improved due to the interaction of double-dark resonances. The probability of finding the atom at a particular position could be doubled, as well as the loealization preeision could be dramatically enhanced. A scheme of sub-half-wavelength localization was proposed via two standing-wave fields in a ladder-type system. We also presented an application of atom localization in 2D atom nano-lithograph, through two cavities orthogonal to each other. The feasibility of control the atom localization behaviors by the external optical fields is shown. Those work may be helpful in the experimental research of atom localization. 

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