Broadband light-trapping enhancement in an ultrathin film a-si absorber using whispering gallery modes and guided wave modes with dielectric surface-textured structures

Gumin Kang, Haesung Park, Dongheok Shin, Seunghwa Baek, Minjung Choi, Dai Hyuk Yu, Kyoungsik Kim, Willie J. Padilla

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

An embedded nanosphere dielectric structure on an a-Si ultrathin film improves weighted absorption from 23.8% to 39.9%. The PMMA embedding layer offers a guided wave mode as well as mechanical robustness, in addition to the resonant whispering gallery modes coupling. Broadband light-trapping enhancements are observed by dielectric surface textured structures of hemispheres, nanocones, nanospheres, or embedded nanospheres.

Original languageEnglish (US)
Pages (from-to)2617-2623
Number of pages7
JournalAdvanced Materials
Volume25
Issue number18
DOIs
StatePublished - May 14 2013

Keywords

  • metamaterials
  • nanostructures
  • photonic crystals
  • self-assembly
  • whispering gallery modes

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