By P.W. Milonni
The propagation of sunshine in dispersive media is a topic of primary in addition to useful significance. in recent times cognizance has concentrated particularly on how refractive index can range with frequency in any such approach that the crowd velocities of optical pulses could be a lot higher or a lot smaller than the rate of sunshine in vacuum, or during which the refractive index will be unfavourable. Treating those subject matters at an introductory to intermediate point, speedy mild, gradual mild and Left-Handed gentle specializes in the fundamental conception and describes the numerous experimental growth made in past times decade. The booklet can pay enormous awareness to the truth that superluminal workforce velocities are usually not in clash with certain relativity and to the position of quantum results in combating superluminal verbal exchange and violations of Einstein causality. It additionally explores many of the uncomplicated physics on the contrary severe of very gradual team velocities in addition to stopped and regenerated mild, together with the suggestions of electromagnetically brought on transparency and dark-state polaritons. one other very energetic point of the topic mentioned issues the opportunity of designing metamaterials during which the refractive index might be adverse and propagating gentle is left-handed within the experience that the part and staff velocities are in contrary instructions. The final chapters are an advent to a few of the fundamental idea and results of unfavourable refractive index, with emphasis at the seminal paintings performed in view that 2000. the prospect that "perfect" lenses may be made up of negative-index metamaterials-which has been possibly themost debatable point of the field-is brought and mentioned in a few aspect.
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Extra resources for Fast light, slow light, and left-handed light
The laser frequency was varied across the absorption line to determine the delay time and, therefore, the group velocity as a function of frequency. 34) was also well satisfied. 2 shows the measured pulse delay time and group velocity as the laser frequency was varied across the Lorentzian absorption curve. Chu and Wong remarked: ‘Although the delay as a function of laser frequency is a smooth, well behaved function, the pulse velocity goes through some rather counter-intuitive singularities’ implied by the formula vg (ω) = c/[n(ω) + ω dn(ω)/dω].
Wang et al used a 6-cm cesium cell coated with paraffin, which allows atoms to maintain their spin polarization when they collide with the walls. 6 by optical pumping with polarized light. Two right-hand circularly polarized, continuous- Copyright © 2005 IOP Publishing Ltd. 6. Approximate level diagram of cesium in the experiments of Wang et al. From , with permission. 6. 6 is the final state of the Raman transition, while the state |0 serves as the primary intermediate state. 5 were obtained.
But just what is meant by a signal? According to Sommerfeld [32, p 18], In order to be able to say something about propagation, we must . . have a limited wave motion: nothing until a certain moment in time, then, for instance, a series of regular sine waves, which stop after a certain time or which continue indefinitely. Such a wave motion will be called a signal. According to this definition, a signal involves new information or an element of ‘surprise’ that could not have been predicted from the wave motion at an earlier time.