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Robust photonic band gap from tunable scatterers

Zhang1, Lei, Wang

  • 1Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

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|October 6, 2000
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Summary

Photonic band gaps are achievable using metal spheres. Robust gaps form in periodic structures above a specific filling ratio, depending on local order, not long-range symmetry.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Photonics

Background:

  • Photonic band gaps (PBGs) are crucial for controlling light propagation.
  • Existing methods often rely on complex structures with long-range order.
  • Novel approaches are needed for scalable and robust PBG realization.

Purpose of the Study:

  • To investigate the theoretical and experimental feasibility of creating photonic band gaps using metal or metal-coated spheres.
  • To determine the conditions under which robust photonic gaps can be achieved.
  • To explore the dependence of photonic gap properties on structural order.

Main Methods:

  • Theoretical modeling of electromagnetic wave propagation in periodic structures of spheres.
  • Experimental fabrication and characterization of metal sphere metamaterials.
  • Microwave regime measurements to validate theoretical predictions.

Main Results:

  • Demonstrated that photonic band gaps can be realized with metal or metal-coated spheres.
  • Established that robust photonic gaps exist when the sphere filling ratio exceeds a threshold.
  • Showed that gap properties are primarily governed by local order, not long-range symmetry.

Conclusions:

  • Periodic structures of metal spheres offer a viable route to robust photonic band gaps.
  • The findings are independent of global symmetry, simplifying fabrication.
  • The approach is scalable to optical frequencies, even with material absorption.