Energy-Transport, Group, and Signal Velocities near Resonance in Spatially Dispersive Media

Puri, Ashok; Birman, Joseph L.

doi:10.1103/physrevlett.47.173

Cited by 16 publications

(3 citation statements)

References 13 publications

(10 reference statements)

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“…Loudon [2] studied the transfer of electromagnetic energy in a local dielectric with a resonant absorption line. A large number of followers [3][4][5] extended his analysis to include spatial dispersion. The experimental time-of-flight study of Chu and Wong [6] of a laser pulse tuned to the bound exciton (BX) line in GaP verified the prediction of Garrett and McCumber [7] on the dramatic variation of group velocity at a resonance.…”

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confidence: 99%

Delay and distortion of slow light pulses by excitons in ZnO

et al. 2011

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Distortion of light pulses in ZnO caused by both bound and free excitons is demonstrated by time-of-flight spectroscopy. Numerous lines of bound excitons dissect the pulse spectrum and induce slowdown of light propagation around the dips. Exciton-polariton resonances determine the overall pulse delay, which approaches 1.6 ns at 3.374 eV for a 0.3 mm propagation length, as well as the pulse curvature in the time-energy plane and its attenuation. Analysis of cw and time-resolved data yields the excitonic parameters inherent for bulk ZnO. A discrepancy is found between these bulk parameters and those given by surface-probing techniques.

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confidence: 99%

Delay and distortion of slow light pulses by excitons in ZnO

et al. 2011

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“…Similar anomalous behavior of the group velocity (without the wave number gap, of course) has been known for a long time, for instance, in the case of exciton-polaritons. 20 A more general statement that abnormal behavior of group velocity should be expected in the regions of resonant absorption in all dispersive dielectrics was proven in Ref. 21.…”

Section: Strong Inter-band Coupling: Band Hybridizationmentioning

confidence: 99%

Photonic band mixing in linear chains of optically coupled microspheres

Roslyak

2006

Phys. Rev. E

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The paper deals with optical excitations arising in a one-dimensional chain of identical spheres due optical coupling of whispering gallery modes (WGM). The band structure of these excitations depends significantly on the inter-mixing between WGMs characterized by different values of angular quantum number, l. We develop a general theory of the photonic band structure of these excitations taking these effects into account and applied it to several cases of recent experimental interest. In the case of bands originating from WQMs with the angular quantum number of the same parity, the calculated dispersion laws are in good qualitative agreement with recent experiment results. Bands resulting from hybridization of excitations resulting from whispering gallery modes with different parity of l exhibits anomalous dispersion properties characterized by a gap in the allowed values of wave numbers and divergence of group velocity.

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“…The concept of group velocity of an electromagnetic wave packet, born in the early 19 th century [1], has been thoroughly analyzed in many propagation regimes: for dispersive, nondispersive and absorbing properties of the propagation environment [2]. Such a quantity is naturally linked to the propagation velocity of energy.…”

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confidence: 99%

Which group velocity of light in a dispersive medium?

Gawhary

Severini²,

Christillin

2011

Eur. Phys. J. Plus

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The interaction between a light pulse, traveling in air, and a generic linear, non-absorbing and dispersive structure is analyzed. It is shown that energy conservation imposes a constraint between the group velocities of the transmitted and reflected light pulses. It follows that the two fields propagate with group velocities depending on the dispersive properties of the environment (air) and on the transmission properties of the optical structure, and are one faster and the other slower than the incident field. In other words, the group velocity of a light pulse in a dispersive medium is reminiscent of previous interactions. One example is discussed in detail.

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Energy-Transport, Group, and Signal Velocities near Resonance in Spatially Dispersive Media

Cited by 16 publications

References 13 publications

Delay and distortion of slow light pulses by excitons in ZnO

Delay and distortion of slow light pulses by excitons in ZnO

Photonic band mixing in linear chains of optically coupled microspheres

Which group velocity of light in a dispersive medium?

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