Abstract
Multicolor manipulation of negative refraction in a three-level atomic system is
theoretically investigated. Based on multicolor coherence, the negative refractive index can be
obtained with reduced absorption. The refractive index can also be controlled by changing the sum of
the phases of the sidebands in the trichromatic driving fields. By adjusting the sum phase, the
refractive index can be varied between negative and positive in two different frequency bands.
Furthermore, the frequency band corresponding to the negative refractive index is widened by
increasing the intensity and the frequency difference of the trichromatic field.
© 2012 Chinese Optics Letters
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