JOURNAL ARTICLE

Temporal rainbow scattering at boundary-induced time interfaces.

  • Published In: Applied Physics Letters, 2023, v. 122, n. 5. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Stefanini, L.; Ramaccia, D.; Toscano, A.; Bilotti, F. 3 of 3

Abstract

The article focuses on a novel wave phenomenon termed "rainbow temporal scattering," which occurs at a boundary-induced temporal metamaterial interface created by instantaneously changing the conductivity of one plate in a parallel plate waveguide (PPWG). This abrupt temporal interface converts a monochromatic guided wave into a polychromatic rainbow-like radiation scattered into free space, with different frequencies propagating at distinct angles. The authors derive closed-form analytical expressions relating the guided mode to the scattered spectrum and provide design guidelines to control the principal scattering direction by adjusting the waveguide's transverse dimension. These theoretical predictions are validated through full-wave finite difference time domain (FDTD) simulations, demonstrating close agreement and suggesting practical implementations across microwave to optical frequencies using tunable metasurfaces or materials like graphene.

Additional Information

  • Source:Applied Physics Letters. 2023/01, Vol. 122, Issue 5, p1
  • Document Type:Article
  • Subject Area:Earth and Atmospheric Sciences
  • Publication Date:2023
  • ISSN:0003-6951
  • DOI:10.1063/5.0132798
  • Accession Number:161694920
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