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Luminal mirror.

T Z Esirkepov1, S V Bulanov1,2

  • 1Kansai Institute for Photon Science, National Institutes for Quantum and Radiological Science and Technology (QST), 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215, Japan.

Physical Review. E
|March 16, 2024
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Summary

A moving refractive index modulation, acting as a luminal mirror, alters electromagnetic waves. Depending on frequency, waves are transmitted, reflected with frequency upshift, or form standing waves, releasing high-frequency radiation when the modulation ceases.

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Area of Science:

  • Optics and Photonics
  • Electromagnetism
  • Condensed Matter Physics

Background:

  • The interaction of electromagnetic waves with dynamic media is a fundamental area of research.
  • Understanding wave behavior at relativistic speeds is crucial for advanced optical phenomena.

Purpose of the Study:

  • To investigate the behavior of electromagnetic waves interacting with a refractive index modulation moving at the speed of light in vacuum.
  • To characterize the transmission, reflection, and spectral properties of waves interacting with a 'luminal mirror'.

Main Methods:

  • Theoretical analysis of electromagnetic wave propagation in a time-varying dielectric medium.
  • Frequency-domain and time-domain analysis of wave interactions with the moving refractive index modulation.

Main Results:

  • Demonstration of frequency-dependent wave behavior: total transmission with phase shift, standing wave formation, or total reflection with frequency upshift.
  • Characterization of a luminal mirror's effect on short pulses, generating wave packets with increasing local frequency and inverse square spectral density.
  • Observation of high-frequency radiation release upon modulation disappearance.

Conclusions:

  • A refractive index modulation moving at light speed acts as a novel optical element with unique wave manipulation capabilities.
  • The luminal mirror offers a mechanism for generating high-frequency radiation and modifying wave packet characteristics.
  • This work provides insights into fundamental wave-medium interactions with potential applications in frequency conversion and pulse shaping.