Abstract

In a recent Letter [1], the reflectance coefficient was used to resolve the sign choice of the wave vector and refractive index in active media. We argue that such a coefficient loses its physical meaning for active media (at real frequencies) when the field amplification is limited only by gain saturation. In this case, the amplitude reflectance coefficient leads to fictitious noncausal reflected fields when the backward Fourier transform is used.

© 2008 Optical Society of America

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References

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  1. V. U. Nazarov and Y. C. Chang, Opt. Lett. 32, 20 (2007).
    [CrossRef]
  2. J. Skaar, Phys. Rev. E 73, 026605 (2006).
    [CrossRef]

2007 (1)

2006 (1)

J. Skaar, Phys. Rev. E 73, 026605 (2006).
[CrossRef]

Opt. Lett. (1)

Phys. Rev. E (1)

J. Skaar, Phys. Rev. E 73, 026605 (2006).
[CrossRef]

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Figures (1)

Fig. 1
Fig. 1

(a) log 10 E i ( t ) ( A = 1 , T = 8.5 ps , ω 0 = 2.978 rad Phz ) log 10 E r ( t ) for ϵ 3 = 1 , θ = 0 and (b) d 2 = 1 cm ; (c) d 2 = 5 cm . (d) The black region corresponds to the pairs ( d 2 , θ ) for which Eq. (4) of Ref. [1] is incorrect at λ = 633 nm , i.e., case (II) holds.

Equations (2)

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ρ ( ω ) = P 1 ( ω ) [ r 12 + r 23 P 2 ( ω ) ] + r 01 [ 1 + P 2 ( ω ) r 12 r 23 ] 1 + P 2 ( ω ) r 12 r 23 + P 1 ( ω ) r 01 [ r 12 + P 2 ( ω ) r 23 ] .
E r ( t ) = 1 2 π + ρ ( ω ) E i ( ω ) exp ( i ω t ) d ω .

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