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Remote structuring of near-field landscapes.

Vincent Ginis1,2, Marco Piccardo3,4, Michele Tamagnone3

  • 1Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA. ginis@seas.harvard.edu capasso@seas.harvard.edu.

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Researchers developed a new theory for remote electromagnetic near-field shaping using cascaded mode conversion and interference. This allows for unprecedented control over near-field distributions for subwavelength applications.

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Area of Science:

  • Optics and Photonics
  • Electromagnetism
  • Nanotechnology

Background:

  • The electromagnetic near field is crucial for subwavelength applications like microscopy and nanoparticle manipulation.
  • Current methods for near-field structuring rely on local conversion of propagating waves using nanostructures.

Purpose of the Study:

  • To develop a theory for remote shaping of the electromagnetic near field.
  • To enable precise control over near-field distributions beyond conventional methods.

Main Methods:

  • Developed a theory based on cascaded mode conversion and interference of counterpropagating guided waves.
  • Utilized guided waves with different propagation constants for remote field structuring.

Main Results:

  • Demonstrated the ability to control longitudinal and transverse variations of the near field at will.
  • Achieved near-field distributions that deviate from the standard monotonic decay of evanescent fields.
  • Experimental realization confirmed the theoretical predictions.

Conclusions:

  • The developed theory provides a novel approach to remote near-field shaping.
  • The method offers a pathway toward three-dimensional control of the near field for arbitrary polarization states and mode profiles.
  • This opens new possibilities for advanced subwavelength applications.