Periodic metallo-dielectric structures: Electromagnetic absorption and its related developed temperatures

Jean Paul Walker, Venkataraman Swaminathan, Aisha S. Haynes, Haim Grebel

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Multi-layer, metallo-dielectric structures (screens) have long been employed as electromagnetic band filters, either in transmission or in reflection modes. Here we study the radiation energy not transmitted or reflected by these structures (trapped radiation, which is denoted-absorption). The trapped radiation leads to hot surfaces. In these bi-layer screens, the top (front) screen is made of metallic hole-array and the bottom(back) screen ismade ofmetallic disk-array. The gap between themis filled with an array of dielectric spheres. The spheres are embedded in a dielectric host material, which is made of either a heat-insulating (air, polyimide) or heat-conducting (MgO) layer. Electromagnetic intensity trapping of 97% is obtained when a 0.15 micron gap is filled with MgO and Si spheres, which are treated as pure dielectrics (namely, with no added absorption loss). Envisioned applications are anti-fogging surfaces, electromagnetic shields, and energy harvesting structures.

Original languageEnglish (US)
Article number2108
JournalMaterials
Volume12
Issue number13
DOIs
StatePublished - Jul 1 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • Electromagnetic absorption
  • Electromagnetic filters
  • Metallo-dielectric structures
  • Radiation trapping
  • Temperature rise

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