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Related Experiment Video

Updated: Jun 3, 2026

Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
08:07

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Published on: June 18, 2013

Multicolored vertical silicon nanowires.

Kwanyong Seo1, Munib Wober, Paul Steinvurzel

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.

Nano Letters
|March 19, 2011
PubMed
Summary
This summary is machine-generated.

Vertical silicon nanowires display a wide range of colors, unlike bulk silicon. This color variation, controlled by nanowire size, could be used in nanoscale image sensors.

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Last Updated: Jun 3, 2026

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Bulk silicon typically appears gray.
  • Nanomaterials offer unique optical properties compared to their bulk counterparts.

Purpose of the Study:

  • To investigate the optical properties of vertical silicon nanowires.
  • To understand the physical mechanisms behind the observed colors in silicon nanowires.

Main Methods:

  • Fabrication of vertical silicon nanowire arrays.
  • Experimental observation of nanowire colors using bright-field microscopy.
  • Finite difference time domain (FDTD) simulations to model optical behavior.

Main Results:

  • Vertical silicon nanowires exhibit colors across the entire visible spectrum.
  • The color of individual nanowires is dependent on their radii.
  • Observed colors are attributed to guided mode properties, not array scattering effects.

Conclusions:

  • Silicon nanowires can be engineered to produce specific colors based on their dimensions.
  • This color-filtering effect in silicon nanowires holds potential for applications in nanoscale image sensors.