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Yichao Liu1, Fei Sun1, Yibiao Yang1

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Researchers developed a near-zero-index-featured (NZIF) structure to overcome limitations of near-zero-index (NZI) media. This new structure enables broadband, reflectionless wave tunneling, expanding possibilities for optical device applications.

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Electromagnetism

Background:

  • Near-zero-index (NZI) media enable unique optical functionalities like reflectionless wave tunneling.
  • Practical applications of NZI media are limited by their narrow bandwidth, stemming from material singularity (refractive index n≈0).

Purpose of the Study:

  • To overcome the narrow bandwidth limitation of traditional NZI materials.
  • To introduce and demonstrate a novel near-zero-index-featured (NZIF) structure for broadband optical applications.

Main Methods:

  • Transmuting the material singularity of NZI media using controlled optical conformal mapping.
  • Implementing devices with nonmagnetic normal dielectrics (relative permittivity >1).
  • Examining the equivalence between NZI and NZIF structures through subwavelength tunneling waveguides.

Main Results:

  • Demonstrated that the NZIF structure overcomes the bandwidth limitation of singular NZI materials.
  • Observed classic wave tunneling features in a broad frequency range across various geometries.
  • Showcased robustness of these properties against structural defects due to infinite effective local wavelength.

Conclusions:

  • The proposed broadband and lossless NZIF medium offers a viable alternative to singular NZI materials.
  • This advancement paves the way for realizing advanced light-controlling functionalities previously limited by NZI materials.
  • NZIF structures provide a promising platform for developing practical optical devices with extraordinary capabilities.