Tunable negative refraction without absorption via electromagnetically induced chirality

Details Tunable negative refraction without absorption via electromagnetically induced chirality Tunable negative refraction without absorption via electromagnetically induced chirality

2007-02-26

arxiv.org/abs/quant-ph/0702234v2

Physics

Quantum Physics

4 pages, 5 figures (shortened version, submitted to PRL)

Scientific paper

10.1103/PhysRevLett.99.073602

We show that negative refraction with minimal absorption can be obtained by means of quantum interference effects similar to electromagnetically induced transparency. Coupling a magnetic dipole transition coherently with an electric dipole transition leads to electromagnetically induced chirality, which can provide negative refraction without requiring negative permeability, and also suppresses absorption. This technique allows negative refraction in the optical regime at densities where the magnetic susceptibility is still small and with refraction/absorption ratios that are orders of magnitude larger than those achievable previously. Furthermore, the value of the refractive index can be fine-tuned via external laser fields, which is essential for practical realization of sub-diffraction-limit imaging.

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