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Localized modes in open one-dimensional dissipative random systems.

K Yu Bliokh1, Yu P Bliokh, V Freilikher

  • 1Institute of Radio Astronomy, 4 Krasnoznamyonnaya Street, Kharkov, 61002, Ukraine.

Physical Review Letters
|February 7, 2007
PubMed
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Localized quasimodes (resonances) in dissipative 1D random systems are detectable via reflection, even with losses. Surprisingly, small losses enhance resonance detection in reflection, enabling parameter retrieval from reflection data.

Area of Science:

  • Condensed matter physics
  • Wave phenomena in disordered systems
  • Photonics and optics

Background:

  • Localized quasimodes, or resonances, are critical in open dissipative systems.
  • Understanding their behavior in 1D random systems is essential for wave manipulation.
  • Transmission measurements can be obscured by losses, hindering resonance detection.

Purpose of the Study:

  • To theoretically and experimentally investigate the excitation and detection of localized quasimodes in dissipative 1D random systems.
  • To explore the impact of small losses on resonance observability.
  • To develop a method for retrieving system parameters from reflection data.

Main Methods:

  • Theoretical modeling of wave propagation in 1D random systems.

Related Experiment Videos

  • Experimental setup for excitation and detection of quasimodes.
  • Analysis of transmission and reflection spectra.
  • Development and testing of a reflection-based parameter retrieval algorithm.

    • Main Results:

    • Resonances remain detectable in reflection even when transmission is significantly reduced by losses.
    • Small dissipative losses unexpectedly improve the visibility of resonances in reflection compared to lossless systems.
    • An algorithm successfully retrieves sample parameters and resonance characteristics solely from reflection measurements.

    Conclusions:

    • Reflection measurements offer a robust method for detecting localized quasimodes in dissipative 1D random systems.
    • Dissipative losses can paradoxically enhance resonance detection in reflection.
    • Reflection-only measurements provide a viable pathway for characterizing complex disordered systems.