Enhanced Plasmonic Light Absorption for Silicon Schottky-Barrier Photodetectors

Mahdieh Hashemi, Mahmood Hosseini Farzad, N. Asger Mortensen, Sanshui Xiao

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Quantum efficiency of the silicon Schottky-barrier photodetector is limited by the weak interaction between the photons and electrons in the metal. By engineering the metal surfaces, metallic groove structures are proposed to achieve strong light absorption in the metal, where most of the energy is transferred into hot carriers near the Schottky barrier. The proposed broadband photodetector with a bi-grating metallic structure on the silicon substrate enables to absorb 76 % of the infrared light in the metal with a 200-nm bandwidth, while staying insensitive to the incident angle. These results pave a new promising way to attain high quantum efficiency silicon Schottky-barrier photodetectors.
Original languageEnglish
JournalPlasmonics
Volume8
Issue number2
Pages (from-to)1059-1064
ISSN1557-1955
DOIs
Publication statusPublished - 2013

Keywords

  • Surface plasmons
  • Subwavelength structure
  • Schottky photodetectors
  • Enhanced absorption

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