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Reflectionless programmable signal routers.

Jérôme Sol1, Ali Alhulaymi2, A Douglas Stone2

  • 1INSA Rennes, CNRS, IETR-UMR 6164, F-35000 Rennes, France.

Science Advances
|January 25, 2023
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Summary
This summary is machine-generated.

We demonstrate reflectionless programmable signal routing using reflectionless scattering modes (RSMs). This method enables versatile frequency and routing control with minimal signal reflection in networks.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Metamaterials

Background:

  • Coherent perfect absorption (CPA) offers precise control over light or signal interaction.
  • Traditional routing methods in RF and photonic networks can suffer from signal reflections.
  • Reflectionless scattering modes (RSMs) are a generalization of CPA with potential for advanced signal manipulation.

Purpose of the Study:

  • To demonstrate the functionalization of RSMs for reflectionless programmable signal routing.
  • To achieve versatile programmability in operating frequencies and routing functionalities.
  • To investigate the underlying physics of RSMs in highly absorptive, multiresonance systems.

Main Methods:

  • Experimental realization in the microwave domain using a 304-element programmable metasurface.
  • Utilizing an irregularly shaped cavity with strong modal overlap.
  • In situ observation of routing functionalities like wavelength demultiplexing.
  • Numerical simulations to analyze the behavior of scattering singularities under strong absorption.

Main Results:

  • Successful demonstration of reflectionless programmable signal routing with negligible in-coupling reflection.
  • Achieved versatile programmability of operating frequencies and routing functions.
  • Observed wavelength demultiplexing and addressed multichannel excitation requirements.
  • Showcased the failure of simple critical coupling in highly overdamped multiresonance systems and proposed a simulation-based tuning mechanism.

Conclusions:

  • RSMs can be effectively functionalized for advanced, reflectionless signal routing applications.
  • The programmable metasurface enables dynamic control over signal routing in complex resonant cavities.
  • Understanding RSMs in highly absorptive systems provides new avenues for designing efficient RF and photonic networks.