Multicolored vertical silicon nanowires

Kwanyong Seo, Munib Wober, Paul Steinvurzel, Ethan Schonbrun, Yaping Dan, Tal Ellenbogen, Kenneth B. Crozier

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate that vertical silicon nanowires take on a surprising variety of colors covering the entire visible spectrum, in marked contrast to the gray color of bulk silicon. This effect is readily observable by bright-field microscopy, or even to the naked eye. The reflection spectra of the nanowires each show a dip whose position depends on the nanowire radii. We compare the experimental data to the results of finite difference time domain simulations to elucidate the physical mechanisms behind the phenomena we observe. The nanowires are fabricated as arrays, but the vivid colors arise not from scattering or diffractive effects of the array, but from the guided mode properties of the individual nanowires. Each nanowire can thus define its own color, allowing for complex spatial patterning. We anticipate that the color filter effect we demonstrate could be employed in nanoscale image sensor devices.

Original languageEnglish
Pages (from-to)1851-1856
Number of pages6
JournalNano Letters
Volume11
Issue number4
DOIs
StatePublished - 13 Apr 2011
Externally publishedYes

Keywords

  • Vertical silicon nanowire
  • color filtering
  • photodetection
  • selective absorption
  • waveguiding

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