Multicolored Vertical Silicon Nanowires
Kwanyong Seo, Munib Wober, Paul Steinvurzel, Ethan Schonbrun, Yaping Dan, Tal Ellenbogen, Kenneth B Crozier
Nano Letters | AMER CHEMICAL SOC | Published : 2011
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 in..View full abstract
Awarded by Office of Basic Energy Sciences
This work was supported by Zena Technologies. P.S. and T.E. acknowledge support from the Center for Excitonics, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science and Office of Basic Energy Sciences under Award Number DE-SC0001088. Fabrication work was carried out in the Harvard Center for Nanoscale Systems (CNS). We thank Dr. Boris Kuhlmey for many useful discussions.