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Field concentration by exciting surface defect modes.

Mathieu Carras1, Alfredo De Rossi

  • 1Thales Research and Technology France, RD 128, Palaiseau 91767, France, and Matériaux et Phénomènes Quantiques, Université Paris 7, 2, Place Jussieu, 75251 Paris, France. mathieu.carras@thalesgroup.com

Optics Letters
|January 20, 2006
PubMed
Summary

We designed patterned metal surfaces for efficient light concentration. This novel design creates a zero-focal-length concentrator by coupling radiation to a localized surface cavity mode.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Efficient light concentration is crucial for various applications, including solar energy and sensing.
  • Localized surface modes offer unique light-matter interaction properties.

Purpose of the Study:

  • To propose and investigate a novel design for a zero-focal-length concentrator.
  • To achieve efficient broadband coupling of radiation to a localized surface cavity mode.

Main Methods:

  • Utilizing patterned metal-coated surfaces.
  • Employing a defect mode cavity combined with a coupling grating.
  • Investigating through modal expansion method and finite-difference time domain (FDTD) calculations.

Main Results:

  • Demonstrated efficient broadband coupling of radiation.

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  • Achieved a fully localized surface cavity mode.
  • The proposed structure functions as a zero-focal-length concentrator.

    • Conclusions:

    • The designed patterned metal surfaces enable efficient broadband light concentration.
    • The interplay of defect mode cavity and coupling grating is key to the concentrator's performance.
    • This design offers a promising approach for advanced optical applications.