TL;DR
This paper investigates how a material block affects the quantum zero-point energy of light, showing frequency-dependent damping and enhancement, and finds the total Casimir energy remains positive.
Contribution
It provides a detailed analysis of the damped vacuum states of light considering dispersion and absorption, extending understanding of Casimir energies in complex media.
Findings
Zero-point energy is damped below free-space value at certain frequencies.
Regularized Casimir energy is also damped at specific frequencies.
Total Casimir energy remains positive despite damping.
Abstract
We consider one-dimensional propagation of quantum light in the presence of a block of material, with a full account of dispersion and absorption. The electromagnetic zero-point energy for some frequencies is damped (suppressed) by the block below the free-space value, while for other frequencies it is increased. We also calculate the regularized (Casimir) zero-point energy at each frequency and find that it too is damped below the free-space value (zero) for some frequencies. The total Casimir energy is positive.
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