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Unidirectional perfect absorber.

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Summary
This summary is machine-generated.

This study introduces a unidirectional perfect absorber (UPA) using an Aharonov-Bohm interferometer. This device achieves reflection-less absorption in one direction and full transmission in the other, controlled by magnetic flux.

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Area of Science:

  • Photonics and optical metamaterials
  • Quantum optics and interferometry

Background:

  • Optical devices often require control over light propagation direction.
  • Achieving perfect absorption while maintaining directional control is a significant challenge.

Purpose of the Study:

  • To propose and demonstrate a novel unidirectional perfect absorber (UPA).
  • To investigate the tunability of transmission properties using magnetic flux.
  • To explore the realization of a perfect absorber (PA) based on the UPA.

Main Methods:

  • Fabrication of a two-arm Aharonov-Bohm interferometer.
  • Integration of a dissipative resonator side-coupled to a uniform resonator array.
  • Experimental control of magnetic flux, coupling, detuning, and resonator loss.

Main Results:

  • Demonstration of reflection-less perfect absorption in one direction.
  • Achieved reflection-less full transmission in the opposite direction.
  • Magnetic flux was shown to precisely control transmission characteristics.

Conclusions:

  • The developed UPA offers directional control over light absorption and transmission.
  • The UPA serves as a foundation for creating advanced optical devices.
  • The device enables perfect absorption of light from arbitrary superpositions of incident waves.