- Letter
Luminal mirror
Phys. Rev. E 109, L023202 – Published 15 February, 2024
DOI: https://doi.org/10.1103/PhysRevE.109.L023202
Abstract
When a refractive index modulation of dispersive medium moves at the speed of light in vacuum, an incident electromagnetic wave, depending on its frequency, either is totally transmitted with a phase shift, or forms a standing wave, or is totally reflected with the frequency upshift. The luminal mirror converts a short incident pulse into a wave packet with an infinitely growing in time local frequency near the interface and with an energy spectral density that asymptotically is the inverse square of frequency. If the modulation disappears, the high frequency radiation is released.
