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Related Experiment Videos

Time delay distribution in Bragg gratings.

Fabio Ghiringhelli1, Mikhail N Zervas

  • 1Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, United Kingdom. fg1@orc.soton.ac.uk

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 23, 2002
PubMed
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This study analyzes light time delay in photonic band-gap structures, revealing a complex-valued time delay. It introduces local dwell time and discusses nonintuitive phenomena like superluminal transmission.

Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics

Background:

  • One-dimensional photonic band-gap structures are crucial for controlling light propagation.
  • Understanding light-matter interaction, specifically time delay, is essential for device applications.

Purpose of the Study:

  • To develop a layer-by-layer analysis for light time delay in photonic structures.
  • To investigate the physical meaning of complex-valued time delay and local dwell time.
  • To explore nonintuitive temporal phenomena and propose experimental validation.

Main Methods:

  • Layer-by-layer analysis of time delay for reflected and transmitted light.
  • Association of effective Fabry-Pérot cavities with each layer.
  • Computation of average time delay with weighting factors for interference.

Related Experiment Videos

  • Analytical derivation relating local dwell time to energy density distribution.

    • Main Results:

    • A complex-valued time delay is derived, with its real part matching phase time delay and a physical interpretation for the imaginary part.
    • Local dwell time is analytically linked to energy density in gratings with small index changes.
    • Nonintuitive phenomena like superluminal transmission and negative reflection time delays are observed.
    • The impact of structural perturbations on local time delay is quantified.

    Conclusions:

    • The developed layer-by-layer analysis provides a comprehensive understanding of light time delay in photonic band-gap structures.
    • The study offers physical insights into complex time delay and local dwell time.
    • Proposed experimental schemes can measure both real and imaginary parts of the local time delay.