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Pulse reflection by photonic barriers.

G Nimtz1, A Haibel, R-M Vetter

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 9, 2002
PubMed
Summary

Microwave reflection delays by photonic barriers were measured. For opaque barriers, reflection delay was largely independent of barrier length, similar to the Hartman effect in transmission.

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Area of Science:

  • * Physics
  • * Electromagnetism
  • * Optics

Background:

  • * Understanding wave-matter interactions is crucial in electromagnetism.
  • * Photonic barriers offer unique properties for controlling wave propagation.
  • * The Hartman effect describes anomalous transmission phenomena.

Purpose of the Study:

  • * To investigate the time-domain behavior of microwaves reflected by photonic barriers.
  • * To analyze the frequency-domain characteristics of microwave reflection.
  • * To explore the relationship between barrier length and reflection delay.

Main Methods:

  • * Time-domain measurements of microwave reflection.
  • * Frequency-domain analysis of reflected microwave signals.
  • * Utilized photonic barriers of varying lengths.

Main Results:

  • * Observed that reflection delay is nearly constant for opaque barriers, irrespective of their length.
  • * Demonstrated a phenomenon analogous to the Hartman effect in microwave reflection.
  • * Characterized the time and frequency responses of partially reflected microwaves.

Conclusions:

  • * The study confirms an unexpected independence of reflection delay from barrier length for opaque photonic barriers.
  • * This finding suggests a generalized Hartman effect applicable to wave reflection phenomena.
  • * Results provide insights into wave propagation and reflection dynamics in structured media.

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