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Researchers achieved high-order perfect absorption without exceptional points (EPs) using asynchronous coherent input. This method utilizes spatial delay for momentum-dependent phase control, enabling broadband absorption and active wave manipulation.

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Area of Science:

  • Wave physics
  • Metamaterials
  • Optics

Background:

  • High-order perfect absorption offers broadband absorption but typically requires exceptional points (EPs).
  • Realizing high-order perfect absorbers without EPs presents a significant challenge in wave control.

Purpose of the Study:

  • To present a general scattering framework for achieving high-order perfect absorption.
  • To demonstrate high-order perfect absorption in the absence of an exceptional point (EP).
  • To explore the use of asynchronous coherent input for wave control.

Main Methods:

  • Utilizing asynchronous coherent input with spatial delay to introduce a momentum-dependent phase factor.
  • Developing a general scattering framework to analyze wave-matter interactions.
  • Actively controlling momentum-dependent output by manipulating spatial delay.

Main Results:

  • Achieved high-order perfect absorber without relying on an exceptional point (EP).
  • Demonstrated that spatial delay provides a new degree of freedom for reshaping absorption line shapes.
  • Observed significant response to delay length perturbations, even without an EP.

Conclusions:

  • Asynchronous coherent input offers a novel route to high-order perfect absorption.
  • The delay-induced momentum-sensitive interference phenomenon provides new insights for wave control.
  • This work offers a new paradigm for designing wave absorbers and controlling wave phenomena.