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Vertical germanium nanowires as spectrally-selective absorbers across the visible-to-infrared

Authors :
Kenneth B. Crozier
Amit Solanki
Source :
Applied Physics Letters. 105:191115
Publication Year :
2014
Publisher :
AIP Publishing, 2014.

Abstract

Nanostructuring a material permits control over its interaction with light. Advanced methods for controlling the visible-to-infrared absorption spectra of semiconductor materials would present opportunities for photodetectors with engineered spectral response. Here, we experimentally demonstrate the fabrication of arrays of vertical Ge nanowires with different diameters. Measured reflection spectra show dip features for which electromagnetic simulations predict enhanced absorption. These can be shifted to longer wavelengths by increasing the diameters of the nanowires. We show that the reflectance dips broaden if the nanowires exhibit tapering. We furthermore show that observed ripple features in the dips are associated with longitudinal modes of the nanowires.

Details

ISSN :
10773118 and 00036951
Volume :
105
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........f4ad5ce78d45bdb31b7fa0ff10fda953
Full Text :
https://doi.org/10.1063/1.4901438