Light trapping with silicon light funnel arrays

Ashish Prajapati, Yuval Nissan, Tamir Gabay, Gil Shalev

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Silicon light funnels are three-dimensional subwavelength structures in the shape of inverted cones with respect to the incoming illumination. Light funnel (LF) arrays can serve as efficient absorbing layers on account of their light trapping capabilities, which are associated with the presence of high-density complex Mie modes. Specifically, light funnel arrays exhibit broadband absorption enhancement of the solar spectrum. In the current study, we numerically explore the optical coupling between surface light funnel arrays and the underlying substrates. We show that the absorption in the LF array-substrate complex is higher than the absorption in LF arrays of the same height (~10% increase). This, we suggest, implies that a LF array serves as an efficient surface element that imparts additional momentum components to the impinging illumination, and hence optically excites the substrate by near-field light concentration, excitation of traveling guided modes in the substrate, and mode hybridization.

Original languageEnglish
Article number445
Issue number3
StatePublished - 19 Mar 2018


  • Light trapping
  • Light-funnel arrays
  • Mode excitation
  • Nanophotonics
  • Photon management
  • Photovoltaics
  • Solar cells

ASJC Scopus subject areas

  • Materials Science (all)


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