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Area of Science:

  • Physics
  • Wave phenomena
  • Photonics

Background:

  • Focusing light through disordered media is challenging due to scattering.
  • Existing methods often require complex optimization or phase conjugation.

Purpose of the Study:

  • To introduce a new wave front shaping protocol for focusing inside disordered media.
  • To demonstrate its effectiveness without optimization or phase conjugation.

Main Methods:

  • Generalization of the Wigner-Smith time-delay operator.
  • Utilizing the scattering (or transmission) matrix and its derivative with respect to target position.
  • Experimental realization in the microwave regime.

Main Results:

  • Eigenstates of the derived operator are sorted by focusing strength.
  • Demonstrated strong focusing on a designated target.
  • Showcased the ability to bypass targets.

Conclusions:

  • The developed protocol offers a robust method for focusing within disordered media.
  • It is expected to be highly valuable for optical imaging applications in scattering environments.
  • The approach avoids complex optimization and phase conjugation techniques.