A common model for superluminal propagation in absorbing atomic media and lossy metastructures

Details A common model for superluminal propagation in absorbing atomic media and lossy metastructures A common model for superluminal propagation in absorbing atomic media and lossy metastructures

2008-05-28

arxiv.org/abs/0805.4240v2

Physics

Optics

Scientific paper

We analyse the superluminal propagation of narrow-band pulses at resonances in dissipative media. The output waveform is an attenuated, undistorted, time-advanced version of the input which can be interpreted as the result of the interference of two scaled replicas of the input having a positive relative delay. The proposed analysis applies both to the propagation in a passive bulk medium at an electronic resonance and in a dielectric waveguide coupled to a lossy micro-ring resonator. This latter case provides a clear insight of the underlying physical phenomena.

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