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Area of Science:

  • Metamaterials Science
  • Optics and Photonics
  • Electromagnetism

Background:

  • Brewster's law predicts zero reflection for p-polarized light on dielectrics at a specific angle.
  • Material loss in dielectrics disrupts the Brewster condition, causing unavoidable reflection.
  • Existing methods struggle to achieve reflectionless absorption in lossy materials.

Purpose of the Study:

  • To investigate anomalous Brewster effects in nonmagnetic anisotropic metamaterials.
  • To demonstrate tunable absorption and refraction independent of material loss.
  • To overcome the limitations of traditional Brewster's law in absorptive scenarios.

Main Methods:

  • Fabrication of nonmagnetic anisotropic metamaterials.
  • Theoretical analysis based on anisotropy and reciprocity principles.
  • Experimental validation using microwave measurements.

Main Results:

  • Demonstrated an exception to the breakdown of Brewster's law in lossy materials.
  • Achieved independently tunable absorption and refraction.
  • Exhibited wide-bandwidth reflectionless absorption from DC to optical frequencies.
  • Experimental verification of reflectionless Brewster absorbers with high absorbance.

Conclusions:

  • Anomalous Brewster effects are achievable in nonmagnetic anisotropic metamaterials.
  • Anisotropy provides degrees of freedom to protect the Brewster effect against loss.
  • This work opens new avenues for efficient, wide-bandwidth reflectionless absorbers.