The perfect lens on a finite bandwidth

Details The perfect lens on a finite bandwidth The perfect lens on a finite bandwidth

2007-06-20

arxiv.org/abs/0706.3054v1

J. Math. Phys. 50, 012908 (2009)

Physics

Optics

Scientific paper

10.1063/1.3068751

The resolution associated with the so-called perfect lens of thickness $d$ is $-2\pi d/\ln(|\chi+2|/2)$. Here the susceptibility $\chi$ is a Hermitian function in $H^2$ of the upper half-plane, i.e., a $H^2$ function satisfying $\chi(-\omega)=\bar{\chi(\omega)}$. An additional requirement is that the imaginary part of $\chi$ be nonnegative for nonnegative arguments. Given an interval $I$ on the positive half-axis, we compute the distance in $L^\infty(I)$ from a negative constant to this class of functions. This result gives a surprisingly simple and explicit formula for the optimal resolution of the perfect lens on a finite bandwidth.

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