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Area of Science:

  • Non-Hermitian wave engineering
  • Wave scattering phenomena

Background:

  • Coherent perfect absorption (CPA) is the time-reversed process of lasing.
  • CPAs have been realized, but not in disordered media.
  • Random lasers involve complex light scattering in disordered media.

Purpose of the Study:

  • To realize a coherent perfect absorber (CPA) in a disordered medium.
  • To demonstrate the absorption of engineered fields by a random CPA.
  • To explore applications of wave focusing, routing, and absorption.

Main Methods:

  • Utilized microwave technology to construct a random anti-laser.
  • Engineered incoming radiation fields for absorption.
  • Determined field patterns using far-field scattering measurements.

Main Results:

  • Successfully built and demonstrated a random anti-laser.
  • Achieved near-perfect absorption efficiency for engineered fields.
  • Showcased the feasibility of time-reversing complex scattered light fields.

Conclusions:

  • A random CPA was experimentally realized in a disordered medium.
  • The method relies on far-field measurements, offering broad applicability.
  • This technique could enable perfect wave focusing, routing, and absorption.