Fundamental Limit to Linear One-Dimensional Slow Light Structures

Details Fundamental Limit to Linear One-Dimensional Slow Light Structures Fundamental Limit to Linear One-Dimensional Slow Light Structures

2007-10-18

arxiv.org/abs/0710.3575v1

Physics

Optics

Scientific paper

10.1103/PhysRevLett.99.203903

Using a new general approach to limits in optical structures that counts orthogonal waves generated by scattering, we derive an upper limit to the number of bits of delay possible in one-dimensional slow light structures that are based on linear optical response to the signal field. The limit is essentially the product of the length of the structure in wavelengths and the largest relative change in dielectric constant anywhere in the structure at any frequency of interest. It holds for refractive index, absorption or gain variations with arbitrary spectral or spatial form. It is otherwise completely independent of the details of the structure's design, and does not rely on concepts of group velocity or group delay.

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